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Finding the Fourth Proportional to 1,572.66, 2,170.14 and 864.48

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Solution

The fourth proportional to 1,572.66, 2,170.14 and 864.48 is: 1,192.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.66 : 2,170.14 = 864.48 : x
  2. Step 2: Convert to fraction form
    1,572.66/2,170.14 = 864.48/x
  3. Step 3: Cross multiply
    1,572.66x = 2,170.14 × 864.48
  4. Step 4: Simplify right side
    1,572.66x = 1,876,042.63
  5. Step 5: Solve for x
    x = 1,876,042.63/1,572.66
  6. Step 6: Final answer
    x = 1,192.91

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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.