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Finding the Fourth Proportional to 831.76, 1,147.88 and 728.08

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Solution

The fourth proportional to 831.76, 1,147.88 and 728.08 is: 1,004.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.76 : 1,147.88 = 728.08 : x
  2. Step 2: Convert to fraction form
    831.76/1,147.88 = 728.08/x
  3. Step 3: Cross multiply
    831.76x = 1,147.88 × 728.08
  4. Step 4: Simplify right side
    831.76x = 835,748.47
  5. Step 5: Solve for x
    x = 835,748.47/831.76
  6. Step 6: Final answer
    x = 1,004.80

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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.