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Finding the Fourth Proportional to 1,578.17, 2,177.71 and 915.24

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Solution

The fourth proportional to 1,578.17, 2,177.71 and 915.24 is: 1,262.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.17 : 2,177.71 = 915.24 : x
  2. Step 2: Convert to fraction form
    1,578.17/2,177.71 = 915.24/x
  3. Step 3: Cross multiply
    1,578.17x = 2,177.71 × 915.24
  4. Step 4: Simplify right side
    1,578.17x = 1,993,127.30
  5. Step 5: Solve for x
    x = 1,993,127.30/1,578.17
  6. Step 6: Final answer
    x = 1,262.94

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1.5x scale

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.