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Finding the Fourth Proportional to 614.66, 915.40 and 611.15

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Solution

The fourth proportional to 614.66, 915.40 and 611.15 is: 910.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.66 : 915.40 = 611.15 : x
  2. Step 2: Convert to fraction form
    614.66/915.40 = 611.15/x
  3. Step 3: Cross multiply
    614.66x = 915.40 × 611.15
  4. Step 4: Simplify right side
    614.66x = 559,446.71
  5. Step 5: Solve for x
    x = 559,446.71/614.66
  6. Step 6: Final answer
    x = 910.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.