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Finding the Fourth Proportional to 979.99, 1,350.20 and 875.09

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Solution

The fourth proportional to 979.99, 1,350.20 and 875.09 is: 1,205.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.99 : 1,350.20 = 875.09 : x
  2. Step 2: Convert to fraction form
    979.99/1,350.20 = 875.09/x
  3. Step 3: Cross multiply
    979.99x = 1,350.20 × 875.09
  4. Step 4: Simplify right side
    979.99x = 1,181,552.08
  5. Step 5: Solve for x
    x = 1,181,552.08/979.99
  6. Step 6: Final answer
    x = 1,205.68

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1.5x scale

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.