Home / 15,780.08-21,732.36-15,731.60

Finding the Fourth Proportional to 15,780.08, 21,732.36 and 15,731.60

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Solution

The fourth proportional to 15,780.08, 21,732.36 and 15,731.60 is: 21,665.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.08 : 21,732.36 = 15,731.60 : x
  2. Step 2: Convert to fraction form
    15,780.08/21,732.36 = 15,731.60/x
  3. Step 3: Cross multiply
    15,780.08x = 21,732.36 × 15,731.60
  4. Step 4: Simplify right side
    15,780.08x = 341,884,794.58
  5. Step 5: Solve for x
    x = 341,884,794.58/15,780.08
  6. Step 6: Final answer
    x = 21,665.59

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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.