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Finding the Fourth Proportional to 831.23, 1,147.08 and 458.20

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Solution

The fourth proportional to 831.23, 1,147.08 and 458.20 is: 632.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.23 : 1,147.08 = 458.20 : x
  2. Step 2: Convert to fraction form
    831.23/1,147.08 = 458.20/x
  3. Step 3: Cross multiply
    831.23x = 1,147.08 × 458.20
  4. Step 4: Simplify right side
    831.23x = 525,592.06
  5. Step 5: Solve for x
    x = 525,592.06/831.23
  6. Step 6: Final answer
    x = 632.31

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1.5x scale

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.