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Finding the Fourth Proportional to 831.60, 1,125.90 and 831.60

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Solution

The fourth proportional to 831.60, 1,125.90 and 831.60 is: 1,125.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.60 : 1,125.90 = 831.60 : x
  2. Step 2: Convert to fraction form
    831.60/1,125.90 = 831.60/x
  3. Step 3: Cross multiply
    831.60x = 1,125.90 × 831.60
  4. Step 4: Simplify right side
    831.60x = 936,298.44
  5. Step 5: Solve for x
    x = 936,298.44/831.60
  6. Step 6: Final answer
    x = 1,125.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.