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Finding the Fourth Proportional to 1,281,474.40, 1,920,899.40 and 748,721.20

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Solution

The fourth proportional to 1,281,474.40, 1,920,899.40 and 748,721.20 is: 1,122,315.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281,474.40 : 1,920,899.40 = 748,721.20 : x
  2. Step 2: Convert to fraction form
    1,281,474.40/1,920,899.40 = 748,721.20/x
  3. Step 3: Cross multiply
    1,281,474.40x = 1,920,899.40 × 748,721.20
  4. Step 4: Simplify right side
    1,281,474.40x = 1,438,218,103,847.28
  5. Step 5: Solve for x
    x = 1,438,218,103,847.28/1,281,474.40
  6. Step 6: Final answer
    x = 1,122,315.13

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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.