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Finding the Fourth Proportional to 1,125.38, 1,688.07 and 355.88

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Solution

The fourth proportional to 1,125.38, 1,688.07 and 355.88 is: 533.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.38 : 1,688.07 = 355.88 : x
  2. Step 2: Convert to fraction form
    1,125.38/1,688.07 = 355.88/x
  3. Step 3: Cross multiply
    1,125.38x = 1,688.07 × 355.88
  4. Step 4: Simplify right side
    1,125.38x = 600,741.91
  5. Step 5: Solve for x
    x = 600,741.91/1,125.38
  6. Step 6: Final answer
    x = 533.81

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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.