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Finding the Fourth Proportional to 1,565.12, 2,347.86 and 915.86

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Solution

The fourth proportional to 1,565.12, 2,347.86 and 915.86 is: 1,373.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,565.12 : 2,347.86 = 915.86 : x
  2. Step 2: Convert to fraction form
    1,565.12/2,347.86 = 915.86/x
  3. Step 3: Cross multiply
    1,565.12x = 2,347.86 × 915.86
  4. Step 4: Simplify right side
    1,565.12x = 2,150,311.06
  5. Step 5: Solve for x
    x = 2,150,311.06/1,565.12
  6. Step 6: Final answer
    x = 1,373.90

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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.