Home / 15,931.49-21,987.38-9,128.03

Finding the Fourth Proportional to 15,931.49, 21,987.38 and 9,128.03

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Solution

The fourth proportional to 15,931.49, 21,987.38 and 9,128.03 is: 12,597.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,931.49 : 21,987.38 = 9,128.03 : x
  2. Step 2: Convert to fraction form
    15,931.49/21,987.38 = 9,128.03/x
  3. Step 3: Cross multiply
    15,931.49x = 21,987.38 × 9,128.03
  4. Step 4: Simplify right side
    15,931.49x = 200,701,377.14
  5. Step 5: Solve for x
    x = 200,701,377.14/15,931.49
  6. Step 6: Final answer
    x = 12,597.78

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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.