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Finding the Fourth Proportional to 718.61, 1,076.83 and 429.17

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Solution

The fourth proportional to 718.61, 1,076.83 and 429.17 is: 643.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.61 : 1,076.83 = 429.17 : x
  2. Step 2: Convert to fraction form
    718.61/1,076.83 = 429.17/x
  3. Step 3: Cross multiply
    718.61x = 1,076.83 × 429.17
  4. Step 4: Simplify right side
    718.61x = 462,136.67
  5. Step 5: Solve for x
    x = 462,136.67/718.61
  6. Step 6: Final answer
    x = 643.10

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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.