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Finding the Fourth Proportional to 1,569.70, 2,166.62 and 979.90

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Solution

The fourth proportional to 1,569.70, 2,166.62 and 979.90 is: 1,352.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,569.70 : 2,166.62 = 979.90 : x
  2. Step 2: Convert to fraction form
    1,569.70/2,166.62 = 979.90/x
  3. Step 3: Cross multiply
    1,569.70x = 2,166.62 × 979.90
  4. Step 4: Simplify right side
    1,569.70x = 2,123,070.94
  5. Step 5: Solve for x
    x = 2,123,070.94/1,569.70
  6. Step 6: Final answer
    x = 1,352.53

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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.