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Finding the Fourth Proportional to 602.78, 831.86 and 393.06

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Solution

The fourth proportional to 602.78, 831.86 and 393.06 is: 542.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.78 : 831.86 = 393.06 : x
  2. Step 2: Convert to fraction form
    602.78/831.86 = 393.06/x
  3. Step 3: Cross multiply
    602.78x = 831.86 × 393.06
  4. Step 4: Simplify right side
    602.78x = 326,970.89
  5. Step 5: Solve for x
    x = 326,970.89/602.78
  6. Step 6: Final answer
    x = 542.44

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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.