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Finding the Fourth Proportional to 316.88, 475.28 and 100.40

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Solution

The fourth proportional to 316.88, 475.28 and 100.40 is: 150.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.88 : 475.28 = 100.40 : x
  2. Step 2: Convert to fraction form
    316.88/475.28 = 100.40/x
  3. Step 3: Cross multiply
    316.88x = 475.28 × 100.40
  4. Step 4: Simplify right side
    316.88x = 47,718.11
  5. Step 5: Solve for x
    x = 47,718.11/316.88
  6. Step 6: Final answer
    x = 150.59

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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.