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Finding the Fourth Proportional to 760.40, 1,142.43 and 487.02

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Solution

The fourth proportional to 760.40, 1,142.43 and 487.02 is: 731.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.40 : 1,142.43 = 487.02 : x
  2. Step 2: Convert to fraction form
    760.40/1,142.43 = 487.02/x
  3. Step 3: Cross multiply
    760.40x = 1,142.43 × 487.02
  4. Step 4: Simplify right side
    760.40x = 556,386.26
  5. Step 5: Solve for x
    x = 556,386.26/760.40
  6. Step 6: Final answer
    x = 731.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.