Home / 81,312.30-121,806.45-71,570.70

Finding the Fourth Proportional to 81,312.30, 121,806.45 and 71,570.70

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Solution

The fourth proportional to 81,312.30, 121,806.45 and 71,570.70 is: 107,213.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,312.30 : 121,806.45 = 71,570.70 : x
  2. Step 2: Convert to fraction form
    81,312.30/121,806.45 = 71,570.70/x
  3. Step 3: Cross multiply
    81,312.30x = 121,806.45 × 71,570.70
  4. Step 4: Simplify right side
    81,312.30x = 8,717,772,891.02
  5. Step 5: Solve for x
    x = 8,717,772,891.02/81,312.30
  6. Step 6: Final answer
    x = 107,213.46

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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.