Home / 20,988.05-28,965.55-15,673.64

Finding the Fourth Proportional to 20,988.05, 28,965.55 and 15,673.64

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Solution

The fourth proportional to 20,988.05, 28,965.55 and 15,673.64 is: 21,631.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.05 : 28,965.55 = 15,673.64 : x
  2. Step 2: Convert to fraction form
    20,988.05/28,965.55 = 15,673.64/x
  3. Step 3: Cross multiply
    20,988.05x = 28,965.55 × 15,673.64
  4. Step 4: Simplify right side
    20,988.05x = 453,995,603.10
  5. Step 5: Solve for x
    x = 453,995,603.10/20,988.05
  6. Step 6: Final answer
    x = 21,631.15

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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.