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Finding the Fourth Proportional to 1,572.53, 2,170.08 and 864.37

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Solution

The fourth proportional to 1,572.53, 2,170.08 and 864.37 is: 1,192.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.53 : 2,170.08 = 864.37 : x
  2. Step 2: Convert to fraction form
    1,572.53/2,170.08 = 864.37/x
  3. Step 3: Cross multiply
    1,572.53x = 2,170.08 × 864.37
  4. Step 4: Simplify right side
    1,572.53x = 1,875,752.05
  5. Step 5: Solve for x
    x = 1,875,752.05/1,572.53
  6. Step 6: Final answer
    x = 1,192.82

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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.