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Finding the Fourth Proportional to 831.51, 1,147.56 and 458.57

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Solution

The fourth proportional to 831.51, 1,147.56 and 458.57 is: 632.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.51 : 1,147.56 = 458.57 : x
  2. Step 2: Convert to fraction form
    831.51/1,147.56 = 458.57/x
  3. Step 3: Cross multiply
    831.51x = 1,147.56 × 458.57
  4. Step 4: Simplify right side
    831.51x = 526,236.59
  5. Step 5: Solve for x
    x = 526,236.59/831.51
  6. Step 6: Final answer
    x = 632.87

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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.