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Finding the Fourth Proportional to 86,145.69, 129,218.55 and 26,985.97

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Solution

The fourth proportional to 86,145.69, 129,218.55 and 26,985.97 is: 40,478.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,145.69 : 129,218.55 = 26,985.97 : x
  2. Step 2: Convert to fraction form
    86,145.69/129,218.55 = 26,985.97/x
  3. Step 3: Cross multiply
    86,145.69x = 129,218.55 × 26,985.97
  4. Step 4: Simplify right side
    86,145.69x = 3,487,087,778.81
  5. Step 5: Solve for x
    x = 3,487,087,778.81/86,145.69
  6. Step 6: Final answer
    x = 40,478.96

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1.5x scale

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.