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Finding the Fourth Proportional to 900.74, 1,350.15 and 515.30

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Solution

The fourth proportional to 900.74, 1,350.15 and 515.30 is: 772.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.74 : 1,350.15 = 515.30 : x
  2. Step 2: Convert to fraction form
    900.74/1,350.15 = 515.30/x
  3. Step 3: Cross multiply
    900.74x = 1,350.15 × 515.30
  4. Step 4: Simplify right side
    900.74x = 695,732.30
  5. Step 5: Solve for x
    x = 695,732.30/900.74
  6. Step 6: Final answer
    x = 772.40

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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.