Home / 15,428.72-21,290.43-8,715.02

Finding the Fourth Proportional to 15,428.72, 21,290.43 and 8,715.02

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Solution

The fourth proportional to 15,428.72, 21,290.43 and 8,715.02 is: 12,026.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,428.72 : 21,290.43 = 8,715.02 : x
  2. Step 2: Convert to fraction form
    15,428.72/21,290.43 = 8,715.02/x
  3. Step 3: Cross multiply
    15,428.72x = 21,290.43 × 8,715.02
  4. Step 4: Simplify right side
    15,428.72x = 185,546,523.26
  5. Step 5: Solve for x
    x = 185,546,523.26/15,428.72
  6. Step 6: Final answer
    x = 12,026.05

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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.