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Finding the Fourth Proportional to 831.80, 1,248.47 and 421.23

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Solution

The fourth proportional to 831.80, 1,248.47 and 421.23 is: 632.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.80 : 1,248.47 = 421.23 : x
  2. Step 2: Convert to fraction form
    831.80/1,248.47 = 421.23/x
  3. Step 3: Cross multiply
    831.80x = 1,248.47 × 421.23
  4. Step 4: Simplify right side
    831.80x = 525,893.02
  5. Step 5: Solve for x
    x = 525,893.02/831.80
  6. Step 6: Final answer
    x = 632.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.