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Finding the Fourth Proportional to 100,367.76, 138,159.87 and 86,749.59

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Solution

The fourth proportional to 100,367.76, 138,159.87 and 86,749.59 is: 119,413.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,367.76 : 138,159.87 = 86,749.59 : x
  2. Step 2: Convert to fraction form
    100,367.76/138,159.87 = 86,749.59/x
  3. Step 3: Cross multiply
    100,367.76x = 138,159.87 × 86,749.59
  4. Step 4: Simplify right side
    100,367.76x = 11,985,312,076.95
  5. Step 5: Solve for x
    x = 11,985,312,076.95/100,367.76
  6. Step 6: Final answer
    x = 119,413.96

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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.