Home / 28,089.68-38,765-15,515.28

Finding the Fourth Proportional to 28,089.68, 38,765 and 15,515.28

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Solution

The fourth proportional to 28,089.68, 38,765 and 15,515.28 is: 21,411.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,089.68 : 38,765 = 15,515.28 : x
  2. Step 2: Convert to fraction form
    28,089.68/38,765 = 15,515.28/x
  3. Step 3: Cross multiply
    28,089.68x = 38,765 × 15,515.28
  4. Step 4: Simplify right side
    28,089.68x = 601,449,829.20
  5. Step 5: Solve for x
    x = 601,449,829.20/28,089.68
  6. Step 6: Final answer
    x = 21,411.77

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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.