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Finding the Fourth Proportional to 3,115.80, 4,673.70 and 807.30

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Solution

The fourth proportional to 3,115.80, 4,673.70 and 807.30 is: 1,210.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,115.80 : 4,673.70 = 807.30 : x
  2. Step 2: Convert to fraction form
    3,115.80/4,673.70 = 807.30/x
  3. Step 3: Cross multiply
    3,115.80x = 4,673.70 × 807.30
  4. Step 4: Simplify right side
    3,115.80x = 3,773,078.01
  5. Step 5: Solve for x
    x = 3,773,078.01/3,115.80
  6. Step 6: Final answer
    x = 1,210.95

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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.