Home / 20,342.40-28,071.68-11,390.40

Finding the Fourth Proportional to 20,342.40, 28,071.68 and 11,390.40

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Solution

The fourth proportional to 20,342.40, 28,071.68 and 11,390.40 is: 15,718.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,342.40 : 28,071.68 = 11,390.40 : x
  2. Step 2: Convert to fraction form
    20,342.40/28,071.68 = 11,390.40/x
  3. Step 3: Cross multiply
    20,342.40x = 28,071.68 × 11,390.40
  4. Step 4: Simplify right side
    20,342.40x = 319,747,663.87
  5. Step 5: Solve for x
    x = 319,747,663.87/20,342.40
  6. Step 6: Final answer
    x = 15,718.29

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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.