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Finding the Fourth Proportional to 72,987.45, 100,723.41 and 42,790.65

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Solution

The fourth proportional to 72,987.45, 100,723.41 and 42,790.65 is: 59,051.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,987.45 : 100,723.41 = 42,790.65 : x
  2. Step 2: Convert to fraction form
    72,987.45/100,723.41 = 42,790.65/x
  3. Step 3: Cross multiply
    72,987.45x = 100,723.41 × 42,790.65
  4. Step 4: Simplify right side
    72,987.45x = 4,310,020,184.12
  5. Step 5: Solve for x
    x = 4,310,020,184.12/72,987.45
  6. Step 6: Final answer
    x = 59,051.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.