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Finding the Fourth Proportional to 1,569.63, 2,165.45 and 979.85

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Solution

The fourth proportional to 1,569.63, 2,165.45 and 979.85 is: 1,351.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,569.63 : 2,165.45 = 979.85 : x
  2. Step 2: Convert to fraction form
    1,569.63/2,165.45 = 979.85/x
  3. Step 3: Cross multiply
    1,569.63x = 2,165.45 × 979.85
  4. Step 4: Simplify right side
    1,569.63x = 2,121,800.46
  5. Step 5: Solve for x
    x = 2,121,800.46/1,569.63
  6. Step 6: Final answer
    x = 1,351.78

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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.