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Finding the Fourth Proportional to 812.69, 1,121.71 and 463.58

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Solution

The fourth proportional to 812.69, 1,121.71 and 463.58 is: 639.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.69 : 1,121.71 = 463.58 : x
  2. Step 2: Convert to fraction form
    812.69/1,121.71 = 463.58/x
  3. Step 3: Cross multiply
    812.69x = 1,121.71 × 463.58
  4. Step 4: Simplify right side
    812.69x = 520,002.32
  5. Step 5: Solve for x
    x = 520,002.32/812.69
  6. Step 6: Final answer
    x = 639.85

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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.