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Finding the Fourth Proportional to 86,543.70, 129,888.45 and 33,990.90

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Solution

The fourth proportional to 86,543.70, 129,888.45 and 33,990.90 is: 51,014.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,543.70 : 129,888.45 = 33,990.90 : x
  2. Step 2: Convert to fraction form
    86,543.70/129,888.45 = 33,990.90/x
  3. Step 3: Cross multiply
    86,543.70x = 129,888.45 × 33,990.90
  4. Step 4: Simplify right side
    86,543.70x = 4,415,025,315.11
  5. Step 5: Solve for x
    x = 4,415,025,315.11/86,543.70
  6. Step 6: Final answer
    x = 51,014.98

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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.