Home / 90,739.20-136,108.80-28,409.76

Finding the Fourth Proportional to 90,739.20, 136,108.80 and 28,409.76

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Solution

The fourth proportional to 90,739.20, 136,108.80 and 28,409.76 is: 42,614.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,739.20 : 136,108.80 = 28,409.76 : x
  2. Step 2: Convert to fraction form
    90,739.20/136,108.80 = 28,409.76/x
  3. Step 3: Cross multiply
    90,739.20x = 136,108.80 × 28,409.76
  4. Step 4: Simplify right side
    90,739.20x = 3,866,818,341.89
  5. Step 5: Solve for x
    x = 3,866,818,341.89/90,739.20
  6. Step 6: Final answer
    x = 42,614.64

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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.