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Finding the Fourth Proportional to 716.61, 1,073.43 and 578.91

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Solution

The fourth proportional to 716.61, 1,073.43 and 578.91 is: 867.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.61 : 1,073.43 = 578.91 : x
  2. Step 2: Convert to fraction form
    716.61/1,073.43 = 578.91/x
  3. Step 3: Cross multiply
    716.61x = 1,073.43 × 578.91
  4. Step 4: Simplify right side
    716.61x = 621,419.36
  5. Step 5: Solve for x
    x = 621,419.36/716.61
  6. Step 6: Final answer
    x = 867.17

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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.