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Finding the Fourth Proportional to 1,566.80, 2,350.20 and 642.05

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Solution

The fourth proportional to 1,566.80, 2,350.20 and 642.05 is: 963.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,566.80 : 2,350.20 = 642.05 : x
  2. Step 2: Convert to fraction form
    1,566.80/2,350.20 = 642.05/x
  3. Step 3: Cross multiply
    1,566.80x = 2,350.20 × 642.05
  4. Step 4: Simplify right side
    1,566.80x = 1,508,945.91
  5. Step 5: Solve for x
    x = 1,508,945.91/1,566.80
  6. Step 6: Final answer
    x = 963.08

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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.