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Finding the Fourth Proportional to 1,129.53, 1,558.98 and 815.86

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Solution

The fourth proportional to 1,129.53, 1,558.98 and 815.86 is: 1,126.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.53 : 1,558.98 = 815.86 : x
  2. Step 2: Convert to fraction form
    1,129.53/1,558.98 = 815.86/x
  3. Step 3: Cross multiply
    1,129.53x = 1,558.98 × 815.86
  4. Step 4: Simplify right side
    1,129.53x = 1,271,909.42
  5. Step 5: Solve for x
    x = 1,271,909.42/1,129.53
  6. Step 6: Final answer
    x = 1,126.05

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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.