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Finding the Fourth Proportional to 1,137.87, 1,706.58 and 315.90

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Solution

The fourth proportional to 1,137.87, 1,706.58 and 315.90 is: 473.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.87 : 1,706.58 = 315.90 : x
  2. Step 2: Convert to fraction form
    1,137.87/1,706.58 = 315.90/x
  3. Step 3: Cross multiply
    1,137.87x = 1,706.58 × 315.90
  4. Step 4: Simplify right side
    1,137.87x = 539,108.62
  5. Step 5: Solve for x
    x = 539,108.62/1,137.87
  6. Step 6: Final answer
    x = 473.79

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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.