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Finding the Fourth Proportional to 100,385.42, 138,530.93 and 55,062.50

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Solution

The fourth proportional to 100,385.42, 138,530.93 and 55,062.50 is: 75,985.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,385.42 : 138,530.93 = 55,062.50 : x
  2. Step 2: Convert to fraction form
    100,385.42/138,530.93 = 55,062.50/x
  3. Step 3: Cross multiply
    100,385.42x = 138,530.93 × 55,062.50
  4. Step 4: Simplify right side
    100,385.42x = 7,627,858,365.16
  5. Step 5: Solve for x
    x = 7,627,858,365.16/100,385.42
  6. Step 6: Final answer
    x = 75,985.72

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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.