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Finding the Fourth Proportional to 939.95, 1,298.45 and 679.34

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Solution

The fourth proportional to 939.95, 1,298.45 and 679.34 is: 938.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.95 : 1,298.45 = 679.34 : x
  2. Step 2: Convert to fraction form
    939.95/1,298.45 = 679.34/x
  3. Step 3: Cross multiply
    939.95x = 1,298.45 × 679.34
  4. Step 4: Simplify right side
    939.95x = 882,079.13
  5. Step 5: Solve for x
    x = 882,079.13/939.95
  6. Step 6: Final answer
    x = 938.44

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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.