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Finding the Fourth Proportional to 768.68, 1,060.81 and 602.61

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Solution

The fourth proportional to 768.68, 1,060.81 and 602.61 is: 831.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.68 : 1,060.81 = 602.61 : x
  2. Step 2: Convert to fraction form
    768.68/1,060.81 = 602.61/x
  3. Step 3: Cross multiply
    768.68x = 1,060.81 × 602.61
  4. Step 4: Simplify right side
    768.68x = 639,254.71
  5. Step 5: Solve for x
    x = 639,254.71/768.68
  6. Step 6: Final answer
    x = 831.63

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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.