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Finding the Fourth Proportional to 25,644.90, 38,467.35 and 20,979.30

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Solution

The fourth proportional to 25,644.90, 38,467.35 and 20,979.30 is: 31,468.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,644.90 : 38,467.35 = 20,979.30 : x
  2. Step 2: Convert to fraction form
    25,644.90/38,467.35 = 20,979.30/x
  3. Step 3: Cross multiply
    25,644.90x = 38,467.35 × 20,979.30
  4. Step 4: Simplify right side
    25,644.90x = 807,018,075.86
  5. Step 5: Solve for x
    x = 807,018,075.86/25,644.90
  6. Step 6: Final answer
    x = 31,468.95

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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.