Home / 15,870.16-21,900.60-9,155.80

Finding the Fourth Proportional to 15,870.16, 21,900.60 and 9,155.80

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Solution

The fourth proportional to 15,870.16, 21,900.60 and 9,155.80 is: 12,634.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.16 : 21,900.60 = 9,155.80 : x
  2. Step 2: Convert to fraction form
    15,870.16/21,900.60 = 9,155.80/x
  3. Step 3: Cross multiply
    15,870.16x = 21,900.60 × 9,155.80
  4. Step 4: Simplify right side
    15,870.16x = 200,517,513.48
  5. Step 5: Solve for x
    x = 200,517,513.48/15,870.16
  6. Step 6: Final answer
    x = 12,634.88

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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.