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Finding the Fourth Proportional to 28,353.40, 42,530.12 and 12,752.80

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Solution

The fourth proportional to 28,353.40, 42,530.12 and 12,752.80 is: 19,129.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,353.40 : 42,530.12 = 12,752.80 : x
  2. Step 2: Convert to fraction form
    28,353.40/42,530.12 = 12,752.80/x
  3. Step 3: Cross multiply
    28,353.40x = 42,530.12 × 12,752.80
  4. Step 4: Simplify right side
    28,353.40x = 542,378,114.34
  5. Step 5: Solve for x
    x = 542,378,114.34/28,353.40
  6. Step 6: Final answer
    x = 19,129.21

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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.