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Finding the Fourth Proportional to 831.60, 1,147.76 and 691.53

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Solution

The fourth proportional to 831.60, 1,147.76 and 691.53 is: 954.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.60 : 1,147.76 = 691.53 : x
  2. Step 2: Convert to fraction form
    831.60/1,147.76 = 691.53/x
  3. Step 3: Cross multiply
    831.60x = 1,147.76 × 691.53
  4. Step 4: Simplify right side
    831.60x = 793,707.02
  5. Step 5: Solve for x
    x = 793,707.02/831.60
  6. Step 6: Final answer
    x = 954.43

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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.