Home / 20,715.60-31,073.40-19,419.60

Finding the Fourth Proportional to 20,715.60, 31,073.40 and 19,419.60

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Solution

The fourth proportional to 20,715.60, 31,073.40 and 19,419.60 is: 29,129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.60 : 31,073.40 = 19,419.60 : x
  2. Step 2: Convert to fraction form
    20,715.60/31,073.40 = 19,419.60/x
  3. Step 3: Cross multiply
    20,715.60x = 31,073.40 × 19,419.60
  4. Step 4: Simplify right side
    20,715.60x = 603,432,998.64
  5. Step 5: Solve for x
    x = 603,432,998.64/20,715.60
  6. Step 6: Final answer
    x = 29,129.40

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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.