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Finding the Fourth Proportional to 105.61, 145.70 and 86.95

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Solution

The fourth proportional to 105.61, 145.70 and 86.95 is: 119.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.61 : 145.70 = 86.95 : x
  2. Step 2: Convert to fraction form
    105.61/145.70 = 86.95/x
  3. Step 3: Cross multiply
    105.61x = 145.70 × 86.95
  4. Step 4: Simplify right side
    105.61x = 12,668.18
  5. Step 5: Solve for x
    x = 12,668.18/105.61
  6. Step 6: Final answer
    x = 119.95

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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.