Home / 20,761.79-31,127.59-8,278.07

Finding the Fourth Proportional to 20,761.79, 31,127.59 and 8,278.07

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Solution

The fourth proportional to 20,761.79, 31,127.59 and 8,278.07 is: 12,411.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.79 : 31,127.59 = 8,278.07 : x
  2. Step 2: Convert to fraction form
    20,761.79/31,127.59 = 8,278.07/x
  3. Step 3: Cross multiply
    20,761.79x = 31,127.59 × 8,278.07
  4. Step 4: Simplify right side
    20,761.79x = 257,676,368.95
  5. Step 5: Solve for x
    x = 257,676,368.95/20,761.79
  6. Step 6: Final answer
    x = 12,411.09

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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.