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Finding the Fourth Proportional to 939.99, 1,298.12 and 774.75

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Solution

The fourth proportional to 939.99, 1,298.12 and 774.75 is: 1,069.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.99 : 1,298.12 = 774.75 : x
  2. Step 2: Convert to fraction form
    939.99/1,298.12 = 774.75/x
  3. Step 3: Cross multiply
    939.99x = 1,298.12 × 774.75
  4. Step 4: Simplify right side
    939.99x = 1,005,714.60
  5. Step 5: Solve for x
    x = 1,005,714.60/939.99
  6. Step 6: Final answer
    x = 1,069.92

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Double scale
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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.