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Finding the Fourth Proportional to 140,412.80, 210,619.20 and 87,924.80

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Solution

The fourth proportional to 140,412.80, 210,619.20 and 87,924.80 is: 131,887.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,412.80 : 210,619.20 = 87,924.80 : x
  2. Step 2: Convert to fraction form
    140,412.80/210,619.20 = 87,924.80/x
  3. Step 3: Cross multiply
    140,412.80x = 210,619.20 × 87,924.80
  4. Step 4: Simplify right side
    140,412.80x = 18,518,651,036.16
  5. Step 5: Solve for x
    x = 18,518,651,036.16/140,412.80
  6. Step 6: Final answer
    x = 131,887.20

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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.