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Finding the Fourth Proportional to 21,959.70, 32,939.55 and 6,378.90

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Solution

The fourth proportional to 21,959.70, 32,939.55 and 6,378.90 is: 9,568.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.70 : 32,939.55 = 6,378.90 : x
  2. Step 2: Convert to fraction form
    21,959.70/32,939.55 = 6,378.90/x
  3. Step 3: Cross multiply
    21,959.70x = 32,939.55 × 6,378.90
  4. Step 4: Simplify right side
    21,959.70x = 210,118,095.50
  5. Step 5: Solve for x
    x = 210,118,095.50/21,959.70
  6. Step 6: Final answer
    x = 9,568.35

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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.