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Finding the Fourth Proportional to 1,329.12, 1,988.64 and 752.40

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Solution

The fourth proportional to 1,329.12, 1,988.64 and 752.40 is: 1,125.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.12 : 1,988.64 = 752.40 : x
  2. Step 2: Convert to fraction form
    1,329.12/1,988.64 = 752.40/x
  3. Step 3: Cross multiply
    1,329.12x = 1,988.64 × 752.40
  4. Step 4: Simplify right side
    1,329.12x = 1,496,252.74
  5. Step 5: Solve for x
    x = 1,496,252.74/1,329.12
  6. Step 6: Final answer
    x = 1,125.75

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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.