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Finding the Fourth Proportional to 915.79, 1,371.38 and 606.71

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Solution

The fourth proportional to 915.79, 1,371.38 and 606.71 is: 908.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.79 : 1,371.38 = 606.71 : x
  2. Step 2: Convert to fraction form
    915.79/1,371.38 = 606.71/x
  3. Step 3: Cross multiply
    915.79x = 1,371.38 × 606.71
  4. Step 4: Simplify right side
    915.79x = 832,026.93
  5. Step 5: Solve for x
    x = 832,026.93/915.79
  6. Step 6: Final answer
    x = 908.53

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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.