Home / 28,139.96-38,834.16-15,564.80

Finding the Fourth Proportional to 28,139.96, 38,834.16 and 15,564.80

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Solution

The fourth proportional to 28,139.96, 38,834.16 and 15,564.80 is: 21,479.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139.96 : 38,834.16 = 15,564.80 : x
  2. Step 2: Convert to fraction form
    28,139.96/38,834.16 = 15,564.80/x
  3. Step 3: Cross multiply
    28,139.96x = 38,834.16 × 15,564.80
  4. Step 4: Simplify right side
    28,139.96x = 604,445,933.57
  5. Step 5: Solve for x
    x = 604,445,933.57/28,139.96
  6. Step 6: Final answer
    x = 21,479.99

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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.