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Finding the Fourth Proportional to 717.56, 990.20 and 407.06

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Solution

The fourth proportional to 717.56, 990.20 and 407.06 is: 561.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.56 : 990.20 = 407.06 : x
  2. Step 2: Convert to fraction form
    717.56/990.20 = 407.06/x
  3. Step 3: Cross multiply
    717.56x = 990.20 × 407.06
  4. Step 4: Simplify right side
    717.56x = 403,063.83
  5. Step 5: Solve for x
    x = 403,063.83/717.56
  6. Step 6: Final answer
    x = 561.72

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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.