Home / 15,499.78-21,389.70-8,426.20

Finding the Fourth Proportional to 15,499.78, 21,389.70 and 8,426.20

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Solution

The fourth proportional to 15,499.78, 21,389.70 and 8,426.20 is: 11,628.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,499.78 : 21,389.70 = 8,426.20 : x
  2. Step 2: Convert to fraction form
    15,499.78/21,389.70 = 8,426.20/x
  3. Step 3: Cross multiply
    15,499.78x = 21,389.70 × 8,426.20
  4. Step 4: Simplify right side
    15,499.78x = 180,233,890.14
  5. Step 5: Solve for x
    x = 180,233,890.14/15,499.78
  6. Step 6: Final answer
    x = 11,628.16

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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.