Home / 15,409.96-21,126.98-15,129.70

Finding the Fourth Proportional to 15,409.96, 21,126.98 and 15,129.70

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Solution

The fourth proportional to 15,409.96, 21,126.98 and 15,129.70 is: 20,742.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,409.96 : 21,126.98 = 15,129.70 : x
  2. Step 2: Convert to fraction form
    15,409.96/21,126.98 = 15,129.70/x
  3. Step 3: Cross multiply
    15,409.96x = 21,126.98 × 15,129.70
  4. Step 4: Simplify right side
    15,409.96x = 319,644,869.31
  5. Step 5: Solve for x
    x = 319,644,869.31/15,409.96
  6. Step 6: Final answer
    x = 20,742.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.