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Finding the Fourth Proportional to 158.76, 219.05 and 99.66

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Solution

The fourth proportional to 158.76, 219.05 and 99.66 is: 137.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.76 : 219.05 = 99.66 : x
  2. Step 2: Convert to fraction form
    158.76/219.05 = 99.66/x
  3. Step 3: Cross multiply
    158.76x = 219.05 × 99.66
  4. Step 4: Simplify right side
    158.76x = 21,830.02
  5. Step 5: Solve for x
    x = 21,830.02/158.76
  6. Step 6: Final answer
    x = 137.50

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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.