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Finding the Fourth Proportional to 79,216.40, 109,228.20 and 63,290

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Solution

The fourth proportional to 79,216.40, 109,228.20 and 63,290 is: 87,267.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,216.40 : 109,228.20 = 63,290 : x
  2. Step 2: Convert to fraction form
    79,216.40/109,228.20 = 63,290/x
  3. Step 3: Cross multiply
    79,216.40x = 109,228.20 × 63,290
  4. Step 4: Simplify right side
    79,216.40x = 6,913,052,778
  5. Step 5: Solve for x
    x = 6,913,052,778/79,216.40
  6. Step 6: Final answer
    x = 87,267.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.