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Finding the Fourth Proportional to 99,999.90, 138,001.86 and 54,680.72

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Solution

The fourth proportional to 99,999.90, 138,001.86 and 54,680.72 is: 75,460.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,999.90 : 138,001.86 = 54,680.72 : x
  2. Step 2: Convert to fraction form
    99,999.90/138,001.86 = 54,680.72/x
  3. Step 3: Cross multiply
    99,999.90x = 138,001.86 × 54,680.72
  4. Step 4: Simplify right side
    99,999.90x = 7,546,041,066.14
  5. Step 5: Solve for x
    x = 7,546,041,066.14/99,999.90
  6. Step 6: Final answer
    x = 75,460.49

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1.5x scale

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.