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Finding the Fourth Proportional to 831.76, 1,147.80 and 482.40

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Solution

The fourth proportional to 831.76, 1,147.80 and 482.40 is: 665.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.76 : 1,147.80 = 482.40 : x
  2. Step 2: Convert to fraction form
    831.76/1,147.80 = 482.40/x
  3. Step 3: Cross multiply
    831.76x = 1,147.80 × 482.40
  4. Step 4: Simplify right side
    831.76x = 553,698.72
  5. Step 5: Solve for x
    x = 553,698.72/831.76
  6. Step 6: Final answer
    x = 665.70

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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.