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Finding the Fourth Proportional to 21,985.40, 32,970.80 and 10,134.30

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Solution

The fourth proportional to 21,985.40, 32,970.80 and 10,134.30 is: 15,198.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,985.40 : 32,970.80 = 10,134.30 : x
  2. Step 2: Convert to fraction form
    21,985.40/32,970.80 = 10,134.30/x
  3. Step 3: Cross multiply
    21,985.40x = 32,970.80 × 10,134.30
  4. Step 4: Simplify right side
    21,985.40x = 334,135,978.44
  5. Step 5: Solve for x
    x = 334,135,978.44/21,985.40
  6. Step 6: Final answer
    x = 15,198.09

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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.