Home / 28,385.13-39,172.70-15,809.88

Finding the Fourth Proportional to 28,385.13, 39,172.70 and 15,809.88

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Solution

The fourth proportional to 28,385.13, 39,172.70 and 15,809.88 is: 21,818.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,385.13 : 39,172.70 = 15,809.88 : x
  2. Step 2: Convert to fraction form
    28,385.13/39,172.70 = 15,809.88/x
  3. Step 3: Cross multiply
    28,385.13x = 39,172.70 × 15,809.88
  4. Step 4: Simplify right side
    28,385.13x = 619,315,686.28
  5. Step 5: Solve for x
    x = 619,315,686.28/28,385.13
  6. Step 6: Final answer
    x = 21,818.31

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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.