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Finding the Fourth Proportional to 85,511.70, 128,267.55 and 84,345.30

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Solution

The fourth proportional to 85,511.70, 128,267.55 and 84,345.30 is: 126,517.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,511.70 : 128,267.55 = 84,345.30 : x
  2. Step 2: Convert to fraction form
    85,511.70/128,267.55 = 84,345.30/x
  3. Step 3: Cross multiply
    85,511.70x = 128,267.55 × 84,345.30
  4. Step 4: Simplify right side
    85,511.70x = 10,818,764,985.02
  5. Step 5: Solve for x
    x = 10,818,764,985.02/85,511.70
  6. Step 6: Final answer
    x = 126,517.95

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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.