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Finding the Fourth Proportional to 1,545.80, 2,319.48 and 680

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Solution

The fourth proportional to 1,545.80, 2,319.48 and 680 is: 1,020.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,545.80 : 2,319.48 = 680 : x
  2. Step 2: Convert to fraction form
    1,545.80/2,319.48 = 680/x
  3. Step 3: Cross multiply
    1,545.80x = 2,319.48 × 680
  4. Step 4: Simplify right side
    1,545.80x = 1,577,246.40
  5. Step 5: Solve for x
    x = 1,577,246.40/1,545.80
  6. Step 6: Final answer
    x = 1,020.34

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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.