Home / 15,117.40-20,858.79-9,147.88

Finding the Fourth Proportional to 15,117.40, 20,858.79 and 9,147.88

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Solution

The fourth proportional to 15,117.40, 20,858.79 and 9,147.88 is: 12,622.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,117.40 : 20,858.79 = 9,147.88 : x
  2. Step 2: Convert to fraction form
    15,117.40/20,858.79 = 9,147.88/x
  3. Step 3: Cross multiply
    15,117.40x = 20,858.79 × 9,147.88
  4. Step 4: Simplify right side
    15,117.40x = 190,813,707.87
  5. Step 5: Solve for x
    x = 190,813,707.87/15,117.40
  6. Step 6: Final answer
    x = 12,622.12

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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.