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Finding the Fourth Proportional to 765.74, 1,054.86 and 718.76

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Solution

The fourth proportional to 765.74, 1,054.86 and 718.76 is: 990.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.74 : 1,054.86 = 718.76 : x
  2. Step 2: Convert to fraction form
    765.74/1,054.86 = 718.76/x
  3. Step 3: Cross multiply
    765.74x = 1,054.86 × 718.76
  4. Step 4: Simplify right side
    765.74x = 758,191.17
  5. Step 5: Solve for x
    x = 758,191.17/765.74
  6. Step 6: Final answer
    x = 990.14

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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.