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Finding the Fourth Proportional to 18,868.55, 28,296.34 and 7,770.13

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Solution

The fourth proportional to 18,868.55, 28,296.34 and 7,770.13 is: 11,652.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,868.55 : 28,296.34 = 7,770.13 : x
  2. Step 2: Convert to fraction form
    18,868.55/28,296.34 = 7,770.13/x
  3. Step 3: Cross multiply
    18,868.55x = 28,296.34 × 7,770.13
  4. Step 4: Simplify right side
    18,868.55x = 219,866,150.16
  5. Step 5: Solve for x
    x = 219,866,150.16/18,868.55
  6. Step 6: Final answer
    x = 11,652.52

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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.