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Finding the Fourth Proportional to 130.40, 179.93 and 77.95

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Solution

The fourth proportional to 130.40, 179.93 and 77.95 is: 107.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.40 : 179.93 = 77.95 : x
  2. Step 2: Convert to fraction form
    130.40/179.93 = 77.95/x
  3. Step 3: Cross multiply
    130.40x = 179.93 × 77.95
  4. Step 4: Simplify right side
    130.40x = 14,025.29
  5. Step 5: Solve for x
    x = 14,025.29/130.40
  6. Step 6: Final answer
    x = 107.56

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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.