Home / 15,591.47-21,516.22-8,421.38

Finding the Fourth Proportional to 15,591.47, 21,516.22 and 8,421.38

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Solution

The fourth proportional to 15,591.47, 21,516.22 and 8,421.38 is: 11,621.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,591.47 : 21,516.22 = 8,421.38 : x
  2. Step 2: Convert to fraction form
    15,591.47/21,516.22 = 8,421.38/x
  3. Step 3: Cross multiply
    15,591.47x = 21,516.22 × 8,421.38
  4. Step 4: Simplify right side
    15,591.47x = 181,196,264.78
  5. Step 5: Solve for x
    x = 181,196,264.78/15,591.47
  6. Step 6: Final answer
    x = 11,621.50

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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.