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Finding the Fourth Proportional to 1,136.56, 1,705.20 and 520.72

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Solution

The fourth proportional to 1,136.56, 1,705.20 and 520.72 is: 781.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.56 : 1,705.20 = 520.72 : x
  2. Step 2: Convert to fraction form
    1,136.56/1,705.20 = 520.72/x
  3. Step 3: Cross multiply
    1,136.56x = 1,705.20 × 520.72
  4. Step 4: Simplify right side
    1,136.56x = 887,931.74
  5. Step 5: Solve for x
    x = 887,931.74/1,136.56
  6. Step 6: Final answer
    x = 781.24

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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.