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Finding the Fourth Proportional to 77.61, 116.40 and 46.80

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Solution

The fourth proportional to 77.61, 116.40 and 46.80 is: 70.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.61 : 116.40 = 46.80 : x
  2. Step 2: Convert to fraction form
    77.61/116.40 = 46.80/x
  3. Step 3: Cross multiply
    77.61x = 116.40 × 46.80
  4. Step 4: Simplify right side
    77.61x = 5,447.52
  5. Step 5: Solve for x
    x = 5,447.52/77.61
  6. Step 6: Final answer
    x = 70.19

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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.