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Finding the Fourth Proportional to 1,127.53, 1,690.39 and 397.62

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Solution

The fourth proportional to 1,127.53, 1,690.39 and 397.62 is: 596.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.53 : 1,690.39 = 397.62 : x
  2. Step 2: Convert to fraction form
    1,127.53/1,690.39 = 397.62/x
  3. Step 3: Cross multiply
    1,127.53x = 1,690.39 × 397.62
  4. Step 4: Simplify right side
    1,127.53x = 672,132.87
  5. Step 5: Solve for x
    x = 672,132.87/1,127.53
  6. Step 6: Final answer
    x = 596.11

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Double scale
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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.