Home / 15,286.78-21,095.87-9,978.46

Finding the Fourth Proportional to 15,286.78, 21,095.87 and 9,978.46

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Solution

The fourth proportional to 15,286.78, 21,095.87 and 9,978.46 is: 13,770.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,286.78 : 21,095.87 = 9,978.46 : x
  2. Step 2: Convert to fraction form
    15,286.78/21,095.87 = 9,978.46/x
  3. Step 3: Cross multiply
    15,286.78x = 21,095.87 × 9,978.46
  4. Step 4: Simplify right side
    15,286.78x = 210,504,294.96
  5. Step 5: Solve for x
    x = 210,504,294.96/15,286.78
  6. Step 6: Final answer
    x = 13,770.35

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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.