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Finding the Fourth Proportional to 153,080, 211,176.79 and 99,381.86

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Solution

The fourth proportional to 153,080, 211,176.79 and 99,381.86 is: 137,099.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,080 : 211,176.79 = 99,381.86 : x
  2. Step 2: Convert to fraction form
    153,080/211,176.79 = 99,381.86/x
  3. Step 3: Cross multiply
    153,080x = 211,176.79 × 99,381.86
  4. Step 4: Simplify right side
    153,080x = 20,987,142,179.03
  5. Step 5: Solve for x
    x = 20,987,142,179.03/153,080
  6. Step 6: Final answer
    x = 137,099.18

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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.