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Finding the Fourth Proportional to 98,387.20, 147,556.80 and 28,259.20

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Solution

The fourth proportional to 98,387.20, 147,556.80 and 28,259.20 is: 42,381.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,387.20 : 147,556.80 = 28,259.20 : x
  2. Step 2: Convert to fraction form
    98,387.20/147,556.80 = 28,259.20/x
  3. Step 3: Cross multiply
    98,387.20x = 147,556.80 × 28,259.20
  4. Step 4: Simplify right side
    98,387.20x = 4,169,837,122.56
  5. Step 5: Solve for x
    x = 4,169,837,122.56/98,387.20
  6. Step 6: Final answer
    x = 42,381.91

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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.