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Finding the Fourth Proportional to 130.19, 179.65 and 77.76

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Solution

The fourth proportional to 130.19, 179.65 and 77.76 is: 107.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.19 : 179.65 = 77.76 : x
  2. Step 2: Convert to fraction form
    130.19/179.65 = 77.76/x
  3. Step 3: Cross multiply
    130.19x = 179.65 × 77.76
  4. Step 4: Simplify right side
    130.19x = 13,969.84
  5. Step 5: Solve for x
    x = 13,969.84/130.19
  6. Step 6: Final answer
    x = 107.31

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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.