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Finding the Fourth Proportional to 73,203.12, 100,986.80 and 42,987.90

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Solution

The fourth proportional to 73,203.12, 100,986.80 and 42,987.90 is: 59,303.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,203.12 : 100,986.80 = 42,987.90 : x
  2. Step 2: Convert to fraction form
    73,203.12/100,986.80 = 42,987.90/x
  3. Step 3: Cross multiply
    73,203.12x = 100,986.80 × 42,987.90
  4. Step 4: Simplify right side
    73,203.12x = 4,341,210,244.78
  5. Step 5: Solve for x
    x = 4,341,210,244.78/73,203.12
  6. Step 6: Final answer
    x = 59,303.62

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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.