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Finding the Fourth Proportional to 18,765.64, 28,139.02 and 6,281.32

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Solution

The fourth proportional to 18,765.64, 28,139.02 and 6,281.32 is: 9,418.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.64 : 28,139.02 = 6,281.32 : x
  2. Step 2: Convert to fraction form
    18,765.64/28,139.02 = 6,281.32/x
  3. Step 3: Cross multiply
    18,765.64x = 28,139.02 × 6,281.32
  4. Step 4: Simplify right side
    18,765.64x = 176,750,189.11
  5. Step 5: Solve for x
    x = 176,750,189.11/18,765.64
  6. Step 6: Final answer
    x = 9,418.82

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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.