Home / 28,359.02-39,129.80-15,781.34

Finding the Fourth Proportional to 28,359.02, 39,129.80 and 15,781.34

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Solution

The fourth proportional to 28,359.02, 39,129.80 and 15,781.34 is: 21,775.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,359.02 : 39,129.80 = 15,781.34 : x
  2. Step 2: Convert to fraction form
    28,359.02/39,129.80 = 15,781.34/x
  3. Step 3: Cross multiply
    28,359.02x = 39,129.80 × 15,781.34
  4. Step 4: Simplify right side
    28,359.02x = 617,520,677.93
  5. Step 5: Solve for x
    x = 617,520,677.93/28,359.02
  6. Step 6: Final answer
    x = 21,775.11

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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.