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Finding the Fourth Proportional to 738.42, 1,018.88 and 439.76

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Solution

The fourth proportional to 738.42, 1,018.88 and 439.76 is: 606.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.42 : 1,018.88 = 439.76 : x
  2. Step 2: Convert to fraction form
    738.42/1,018.88 = 439.76/x
  3. Step 3: Cross multiply
    738.42x = 1,018.88 × 439.76
  4. Step 4: Simplify right side
    738.42x = 448,064.67
  5. Step 5: Solve for x
    x = 448,064.67/738.42
  6. Step 6: Final answer
    x = 606.79

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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.