Home / 15,879.85-21,897.14-13,389.40

Finding the Fourth Proportional to 15,879.85, 21,897.14 and 13,389.40

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Solution

The fourth proportional to 15,879.85, 21,897.14 and 13,389.40 is: 18,462.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.85 : 21,897.14 = 13,389.40 : x
  2. Step 2: Convert to fraction form
    15,879.85/21,897.14 = 13,389.40/x
  3. Step 3: Cross multiply
    15,879.85x = 21,897.14 × 13,389.40
  4. Step 4: Simplify right side
    15,879.85x = 293,189,526.74
  5. Step 5: Solve for x
    x = 293,189,526.74/15,879.85
  6. Step 6: Final answer
    x = 18,462.99

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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.