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Finding the Fourth Proportional to 838.20, 1,155.24 and 672.12

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Solution

The fourth proportional to 838.20, 1,155.24 and 672.12 is: 926.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.20 : 1,155.24 = 672.12 : x
  2. Step 2: Convert to fraction form
    838.20/1,155.24 = 672.12/x
  3. Step 3: Cross multiply
    838.20x = 1,155.24 × 672.12
  4. Step 4: Simplify right side
    838.20x = 776,461.27
  5. Step 5: Solve for x
    x = 776,461.27/838.20
  6. Step 6: Final answer
    x = 926.35

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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.