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Finding the Fourth Proportional to 831.65, 1,147.70 and 500.22

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Solution

The fourth proportional to 831.65, 1,147.70 and 500.22 is: 690.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.65 : 1,147.70 = 500.22 : x
  2. Step 2: Convert to fraction form
    831.65/1,147.70 = 500.22/x
  3. Step 3: Cross multiply
    831.65x = 1,147.70 × 500.22
  4. Step 4: Simplify right side
    831.65x = 574,103.74
  5. Step 5: Solve for x
    x = 574,103.74/831.65
  6. Step 6: Final answer
    x = 690.32

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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.