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Finding the Fourth Proportional to 867.76, 1,300.80 and 380.88

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Solution

The fourth proportional to 867.76, 1,300.80 and 380.88 is: 570.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.76 : 1,300.80 = 380.88 : x
  2. Step 2: Convert to fraction form
    867.76/1,300.80 = 380.88/x
  3. Step 3: Cross multiply
    867.76x = 1,300.80 × 380.88
  4. Step 4: Simplify right side
    867.76x = 495,448.70
  5. Step 5: Solve for x
    x = 495,448.70/867.76
  6. Step 6: Final answer
    x = 570.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.