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Finding the Fourth Proportional to 1,590.98, 2,385.21 and 724.28

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Solution

The fourth proportional to 1,590.98, 2,385.21 and 724.28 is: 1,085.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,590.98 : 2,385.21 = 724.28 : x
  2. Step 2: Convert to fraction form
    1,590.98/2,385.21 = 724.28/x
  3. Step 3: Cross multiply
    1,590.98x = 2,385.21 × 724.28
  4. Step 4: Simplify right side
    1,590.98x = 1,727,559.90
  5. Step 5: Solve for x
    x = 1,727,559.90/1,590.98
  6. Step 6: Final answer
    x = 1,085.85

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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.