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Finding the Fourth Proportional to 900.12, 1,349.94 and 387

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Solution

The fourth proportional to 900.12, 1,349.94 and 387 is: 580.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.12 : 1,349.94 = 387 : x
  2. Step 2: Convert to fraction form
    900.12/1,349.94 = 387/x
  3. Step 3: Cross multiply
    900.12x = 1,349.94 × 387
  4. Step 4: Simplify right side
    900.12x = 522,426.78
  5. Step 5: Solve for x
    x = 522,426.78/900.12
  6. Step 6: Final answer
    x = 580.40

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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.