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Finding the Fourth Proportional to 15,985.78, 23,978.99 and 5,458.21

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Solution

The fourth proportional to 15,985.78, 23,978.99 and 5,458.21 is: 8,187.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,985.78 : 23,978.99 = 5,458.21 : x
  2. Step 2: Convert to fraction form
    15,985.78/23,978.99 = 5,458.21/x
  3. Step 3: Cross multiply
    15,985.78x = 23,978.99 × 5,458.21
  4. Step 4: Simplify right side
    15,985.78x = 130,882,363.01
  5. Step 5: Solve for x
    x = 130,882,363.01/15,985.78
  6. Step 6: Final answer
    x = 8,187.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.