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Finding the Fourth Proportional to 831.16, 1,147.92 and 646.88

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Solution

The fourth proportional to 831.16, 1,147.92 and 646.88 is: 893.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.16 : 1,147.92 = 646.88 : x
  2. Step 2: Convert to fraction form
    831.16/1,147.92 = 646.88/x
  3. Step 3: Cross multiply
    831.16x = 1,147.92 × 646.88
  4. Step 4: Simplify right side
    831.16x = 742,566.49
  5. Step 5: Solve for x
    x = 742,566.49/831.16
  6. Step 6: Final answer
    x = 893.41

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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.