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Finding the Fourth Proportional to 831.72, 1,147.56 and 500.28

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Solution

The fourth proportional to 831.72, 1,147.56 and 500.28 is: 690.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.72 : 1,147.56 = 500.28 : x
  2. Step 2: Convert to fraction form
    831.72/1,147.56 = 500.28/x
  3. Step 3: Cross multiply
    831.72x = 1,147.56 × 500.28
  4. Step 4: Simplify right side
    831.72x = 574,101.32
  5. Step 5: Solve for x
    x = 574,101.32/831.72
  6. Step 6: Final answer
    x = 690.26

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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.