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Finding the Fourth Proportional to 77,108.80, 115,490.40 and 40,129.60

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Solution

The fourth proportional to 77,108.80, 115,490.40 and 40,129.60 is: 60,104.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,108.80 : 115,490.40 = 40,129.60 : x
  2. Step 2: Convert to fraction form
    77,108.80/115,490.40 = 40,129.60/x
  3. Step 3: Cross multiply
    77,108.80x = 115,490.40 × 40,129.60
  4. Step 4: Simplify right side
    77,108.80x = 4,634,583,555.84
  5. Step 5: Solve for x
    x = 4,634,583,555.84/77,108.80
  6. Step 6: Final answer
    x = 60,104.47

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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.