Home / 18,715.40-25,821.05-12,345.15

Finding the Fourth Proportional to 18,715.40, 25,821.05 and 12,345.15

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Solution

The fourth proportional to 18,715.40, 25,821.05 and 12,345.15 is: 17,032.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.40 : 25,821.05 = 12,345.15 : x
  2. Step 2: Convert to fraction form
    18,715.40/25,821.05 = 12,345.15/x
  3. Step 3: Cross multiply
    18,715.40x = 25,821.05 × 12,345.15
  4. Step 4: Simplify right side
    18,715.40x = 318,764,863.10
  5. Step 5: Solve for x
    x = 318,764,863.10/18,715.40
  6. Step 6: Final answer
    x = 17,032.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.