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Finding the Fourth Proportional to 1,578.70, 2,179.08 and 915.85

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Solution

The fourth proportional to 1,578.70, 2,179.08 and 915.85 is: 1,264.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.70 : 2,179.08 = 915.85 : x
  2. Step 2: Convert to fraction form
    1,578.70/2,179.08 = 915.85/x
  3. Step 3: Cross multiply
    1,578.70x = 2,179.08 × 915.85
  4. Step 4: Simplify right side
    1,578.70x = 1,995,710.42
  5. Step 5: Solve for x
    x = 1,995,710.42/1,578.70
  6. Step 6: Final answer
    x = 1,264.15

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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.