Home / 1,278.18-1,915.90-729.18

Finding the Fourth Proportional to 1,278.18, 1,915.90 and 729.18

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Solution

The fourth proportional to 1,278.18, 1,915.90 and 729.18 is: 1,092.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.18 : 1,915.90 = 729.18 : x
  2. Step 2: Convert to fraction form
    1,278.18/1,915.90 = 729.18/x
  3. Step 3: Cross multiply
    1,278.18x = 1,915.90 × 729.18
  4. Step 4: Simplify right side
    1,278.18x = 1,397,035.96
  5. Step 5: Solve for x
    x = 1,397,035.96/1,278.18
  6. Step 6: Final answer
    x = 1,092.99

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1.5x scale

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.