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Finding the Fourth Proportional to 753.74, 1,040.45 and 439.19

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Solution

The fourth proportional to 753.74, 1,040.45 and 439.19 is: 606.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.74 : 1,040.45 = 439.19 : x
  2. Step 2: Convert to fraction form
    753.74/1,040.45 = 439.19/x
  3. Step 3: Cross multiply
    753.74x = 1,040.45 × 439.19
  4. Step 4: Simplify right side
    753.74x = 456,951.74
  5. Step 5: Solve for x
    x = 456,951.74/753.74
  6. Step 6: Final answer
    x = 606.25

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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.