Home / 20,881.89-31,281.09-12,557.34

Finding the Fourth Proportional to 20,881.89, 31,281.09 and 12,557.34

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Solution

The fourth proportional to 20,881.89, 31,281.09 and 12,557.34 is: 18,810.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.89 : 31,281.09 = 12,557.34 : x
  2. Step 2: Convert to fraction form
    20,881.89/31,281.09 = 12,557.34/x
  3. Step 3: Cross multiply
    20,881.89x = 31,281.09 × 12,557.34
  4. Step 4: Simplify right side
    20,881.89x = 392,807,282.70
  5. Step 5: Solve for x
    x = 392,807,282.70/20,881.89
  6. Step 6: Final answer
    x = 18,810.91

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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.