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Finding the Fourth Proportional to 602.64, 831.42 and 393.08

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Solution

The fourth proportional to 602.64, 831.42 and 393.08 is: 542.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.64 : 831.42 = 393.08 : x
  2. Step 2: Convert to fraction form
    602.64/831.42 = 393.08/x
  3. Step 3: Cross multiply
    602.64x = 831.42 × 393.08
  4. Step 4: Simplify right side
    602.64x = 326,810.42
  5. Step 5: Solve for x
    x = 326,810.42/602.64
  6. Step 6: Final answer
    x = 542.30

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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.