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Finding the Fourth Proportional to 1,039.98, 1,435.44 and 646.76

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Solution

The fourth proportional to 1,039.98, 1,435.44 and 646.76 is: 892.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.98 : 1,435.44 = 646.76 : x
  2. Step 2: Convert to fraction form
    1,039.98/1,435.44 = 646.76/x
  3. Step 3: Cross multiply
    1,039.98x = 1,435.44 × 646.76
  4. Step 4: Simplify right side
    1,039.98x = 928,385.17
  5. Step 5: Solve for x
    x = 928,385.17/1,039.98
  6. Step 6: Final answer
    x = 892.70

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Double scale
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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.