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Finding the Fourth Proportional to 90,804.76, 136,230.18 and 28,475.80

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Solution

The fourth proportional to 90,804.76, 136,230.18 and 28,475.80 is: 42,720.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,804.76 : 136,230.18 = 28,475.80 : x
  2. Step 2: Convert to fraction form
    90,804.76/136,230.18 = 28,475.80/x
  3. Step 3: Cross multiply
    90,804.76x = 136,230.18 × 28,475.80
  4. Step 4: Simplify right side
    90,804.76x = 3,879,263,359.64
  5. Step 5: Solve for x
    x = 3,879,263,359.64/90,804.76
  6. Step 6: Final answer
    x = 42,720.93

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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.