Home / 20,871.60-31,307.40-18,279.60

Finding the Fourth Proportional to 20,871.60, 31,307.40 and 18,279.60

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Solution

The fourth proportional to 20,871.60, 31,307.40 and 18,279.60 is: 27,419.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.60 : 31,307.40 = 18,279.60 : x
  2. Step 2: Convert to fraction form
    20,871.60/31,307.40 = 18,279.60/x
  3. Step 3: Cross multiply
    20,871.60x = 31,307.40 × 18,279.60
  4. Step 4: Simplify right side
    20,871.60x = 572,286,749.04
  5. Step 5: Solve for x
    x = 572,286,749.04/20,871.60
  6. Step 6: Final answer
    x = 27,419.40

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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.