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Finding the Fourth Proportional to 768.54, 1,060.45 and 469.72

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Solution

The fourth proportional to 768.54, 1,060.45 and 469.72 is: 648.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.54 : 1,060.45 = 469.72 : x
  2. Step 2: Convert to fraction form
    768.54/1,060.45 = 469.72/x
  3. Step 3: Cross multiply
    768.54x = 1,060.45 × 469.72
  4. Step 4: Simplify right side
    768.54x = 498,114.57
  5. Step 5: Solve for x
    x = 498,114.57/768.54
  6. Step 6: Final answer
    x = 648.13

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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.