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Finding the Fourth Proportional to 1,572.16, 2,169.63 and 864.07

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Solution

The fourth proportional to 1,572.16, 2,169.63 and 864.07 is: 1,192.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.16 : 2,169.63 = 864.07 : x
  2. Step 2: Convert to fraction form
    1,572.16/2,169.63 = 864.07/x
  3. Step 3: Cross multiply
    1,572.16x = 2,169.63 × 864.07
  4. Step 4: Simplify right side
    1,572.16x = 1,874,714.91
  5. Step 5: Solve for x
    x = 1,874,714.91/1,572.16
  6. Step 6: Final answer
    x = 1,192.45

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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.