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Finding the Fourth Proportional to 90,858.65, 136,309.95 and 28,529.15

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Solution

The fourth proportional to 90,858.65, 136,309.95 and 28,529.15 is: 42,800.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,858.65 : 136,309.95 = 28,529.15 : x
  2. Step 2: Convert to fraction form
    90,858.65/136,309.95 = 28,529.15/x
  3. Step 3: Cross multiply
    90,858.65x = 136,309.95 × 28,529.15
  4. Step 4: Simplify right side
    90,858.65x = 3,888,807,350.82
  5. Step 5: Solve for x
    x = 3,888,807,350.82/90,858.65
  6. Step 6: Final answer
    x = 42,800.63

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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.