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Finding the Fourth Proportional to 666.01, 916.87 and 499.95

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Solution

The fourth proportional to 666.01, 916.87 and 499.95 is: 688.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.01 : 916.87 = 499.95 : x
  2. Step 2: Convert to fraction form
    666.01/916.87 = 499.95/x
  3. Step 3: Cross multiply
    666.01x = 916.87 × 499.95
  4. Step 4: Simplify right side
    666.01x = 458,389.16
  5. Step 5: Solve for x
    x = 458,389.16/666.01
  6. Step 6: Final answer
    x = 688.26

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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.