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Finding the Fourth Proportional to 840.65, 1,160.61 and 542.03

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Solution

The fourth proportional to 840.65, 1,160.61 and 542.03 is: 748.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.65 : 1,160.61 = 542.03 : x
  2. Step 2: Convert to fraction form
    840.65/1,160.61 = 542.03/x
  3. Step 3: Cross multiply
    840.65x = 1,160.61 × 542.03
  4. Step 4: Simplify right side
    840.65x = 629,088.34
  5. Step 5: Solve for x
    x = 629,088.34/840.65
  6. Step 6: Final answer
    x = 748.34

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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.