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Finding the Fourth Proportional to 1,030.04, 1,420.86 and 636.76

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Solution

The fourth proportional to 1,030.04, 1,420.86 and 636.76 is: 878.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.04 : 1,420.86 = 636.76 : x
  2. Step 2: Convert to fraction form
    1,030.04/1,420.86 = 636.76/x
  3. Step 3: Cross multiply
    1,030.04x = 1,420.86 × 636.76
  4. Step 4: Simplify right side
    1,030.04x = 904,746.81
  5. Step 5: Solve for x
    x = 904,746.81/1,030.04
  6. Step 6: Final answer
    x = 878.36

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.