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Finding the Fourth Proportional to 1,569.69, 2,166.13 and 861.55

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Solution

The fourth proportional to 1,569.69, 2,166.13 and 861.55 is: 1,188.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,569.69 : 2,166.13 = 861.55 : x
  2. Step 2: Convert to fraction form
    1,569.69/2,166.13 = 861.55/x
  3. Step 3: Cross multiply
    1,569.69x = 2,166.13 × 861.55
  4. Step 4: Simplify right side
    1,569.69x = 1,866,221.73
  5. Step 5: Solve for x
    x = 1,866,221.73/1,569.69
  6. Step 6: Final answer
    x = 1,188.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.