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Finding the Fourth Proportional to 1,490.13, 2,235.78 and 516.87

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Solution

The fourth proportional to 1,490.13, 2,235.78 and 516.87 is: 775.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.13 : 2,235.78 = 516.87 : x
  2. Step 2: Convert to fraction form
    1,490.13/2,235.78 = 516.87/x
  3. Step 3: Cross multiply
    1,490.13x = 2,235.78 × 516.87
  4. Step 4: Simplify right side
    1,490.13x = 1,155,607.61
  5. Step 5: Solve for x
    x = 1,155,607.61/1,490.13
  6. Step 6: Final answer
    x = 775.51

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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.