Home / 20,919.60-31,423.14-17,639.10

Finding the Fourth Proportional to 20,919.60, 31,423.14 and 17,639.10

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Solution

The fourth proportional to 20,919.60, 31,423.14 and 17,639.10 is: 26,495.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.60 : 31,423.14 = 17,639.10 : x
  2. Step 2: Convert to fraction form
    20,919.60/31,423.14 = 17,639.10/x
  3. Step 3: Cross multiply
    20,919.60x = 31,423.14 × 17,639.10
  4. Step 4: Simplify right side
    20,919.60x = 554,275,908.77
  5. Step 5: Solve for x
    x = 554,275,908.77/20,919.60
  6. Step 6: Final answer
    x = 26,495.53

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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.