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Finding the Fourth Proportional to 80,428.40, 120,631.44 and 56,339.76

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Solution

The fourth proportional to 80,428.40, 120,631.44 and 56,339.76 is: 84,501.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,428.40 : 120,631.44 = 56,339.76 : x
  2. Step 2: Convert to fraction form
    80,428.40/120,631.44 = 56,339.76/x
  3. Step 3: Cross multiply
    80,428.40x = 120,631.44 × 56,339.76
  4. Step 4: Simplify right side
    80,428.40x = 6,796,346,378.05
  5. Step 5: Solve for x
    x = 6,796,346,378.05/80,428.40
  6. Step 6: Final answer
    x = 84,501.82

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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.