Home / 15,739.11-21,715.09-10,428.35

Finding the Fourth Proportional to 15,739.11, 21,715.09 and 10,428.35

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Solution

The fourth proportional to 15,739.11, 21,715.09 and 10,428.35 is: 14,387.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,739.11 : 21,715.09 = 10,428.35 : x
  2. Step 2: Convert to fraction form
    15,739.11/21,715.09 = 10,428.35/x
  3. Step 3: Cross multiply
    15,739.11x = 21,715.09 × 10,428.35
  4. Step 4: Simplify right side
    15,739.11x = 226,452,424.16
  5. Step 5: Solve for x
    x = 226,452,424.16/15,739.11
  6. Step 6: Final answer
    x = 14,387.88

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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.