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Finding the Fourth Proportional to 1,490.20, 2,235.48 and 516.40

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Solution

The fourth proportional to 1,490.20, 2,235.48 and 516.40 is: 774.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.20 : 2,235.48 = 516.40 : x
  2. Step 2: Convert to fraction form
    1,490.20/2,235.48 = 516.40/x
  3. Step 3: Cross multiply
    1,490.20x = 2,235.48 × 516.40
  4. Step 4: Simplify right side
    1,490.20x = 1,154,401.87
  5. Step 5: Solve for x
    x = 1,154,401.87/1,490.20
  6. Step 6: Final answer
    x = 774.66

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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.