Home / 21,011.16-31,515.66-5,428.38

Finding the Fourth Proportional to 21,011.16, 31,515.66 and 5,428.38

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Solution

The fourth proportional to 21,011.16, 31,515.66 and 5,428.38 is: 8,142.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.16 : 31,515.66 = 5,428.38 : x
  2. Step 2: Convert to fraction form
    21,011.16/31,515.66 = 5,428.38/x
  3. Step 3: Cross multiply
    21,011.16x = 31,515.66 × 5,428.38
  4. Step 4: Simplify right side
    21,011.16x = 171,078,978.43
  5. Step 5: Solve for x
    x = 171,078,978.43/21,011.16
  6. Step 6: Final answer
    x = 8,142.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.