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Finding the Fourth Proportional to 738.68, 1,019.22 and 428

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Solution

The fourth proportional to 738.68, 1,019.22 and 428 is: 590.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.68 : 1,019.22 = 428 : x
  2. Step 2: Convert to fraction form
    738.68/1,019.22 = 428/x
  3. Step 3: Cross multiply
    738.68x = 1,019.22 × 428
  4. Step 4: Simplify right side
    738.68x = 436,226.16
  5. Step 5: Solve for x
    x = 436,226.16/738.68
  6. Step 6: Final answer
    x = 590.55

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Double scale
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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.