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Finding the Fourth Proportional to 28,452.70, 42,687.69 and 12,870.46

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Solution

The fourth proportional to 28,452.70, 42,687.69 and 12,870.46 is: 19,309.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,452.70 : 42,687.69 = 12,870.46 : x
  2. Step 2: Convert to fraction form
    28,452.70/42,687.69 = 12,870.46/x
  3. Step 3: Cross multiply
    28,452.70x = 42,687.69 × 12,870.46
  4. Step 4: Simplify right side
    28,452.70x = 549,410,206.64
  5. Step 5: Solve for x
    x = 549,410,206.64/28,452.70
  6. Step 6: Final answer
    x = 19,309.60

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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.