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Finding the Fourth Proportional to 1,090.76, 1,503.81 and 717.61

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Solution

The fourth proportional to 1,090.76, 1,503.81 and 717.61 is: 989.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.76 : 1,503.81 = 717.61 : x
  2. Step 2: Convert to fraction form
    1,090.76/1,503.81 = 717.61/x
  3. Step 3: Cross multiply
    1,090.76x = 1,503.81 × 717.61
  4. Step 4: Simplify right side
    1,090.76x = 1,079,141.58
  5. Step 5: Solve for x
    x = 1,079,141.58/1,090.76
  6. Step 6: Final answer
    x = 989.35

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Half scale
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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.