Home / 20,889.60-31,312.80-11,515.20

Finding the Fourth Proportional to 20,889.60, 31,312.80 and 11,515.20

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Solution

The fourth proportional to 20,889.60, 31,312.80 and 11,515.20 is: 17,260.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,889.60 : 31,312.80 = 11,515.20 : x
  2. Step 2: Convert to fraction form
    20,889.60/31,312.80 = 11,515.20/x
  3. Step 3: Cross multiply
    20,889.60x = 31,312.80 × 11,515.20
  4. Step 4: Simplify right side
    20,889.60x = 360,573,154.56
  5. Step 5: Solve for x
    x = 360,573,154.56/20,889.60
  6. Step 6: Final answer
    x = 17,260.89

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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.