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Finding the Fourth Proportional to 738.46, 1,018.85 and 419.38

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Solution

The fourth proportional to 738.46, 1,018.85 and 419.38 is: 578.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.46 : 1,018.85 = 419.38 : x
  2. Step 2: Convert to fraction form
    738.46/1,018.85 = 419.38/x
  3. Step 3: Cross multiply
    738.46x = 1,018.85 × 419.38
  4. Step 4: Simplify right side
    738.46x = 427,278.12
  5. Step 5: Solve for x
    x = 427,278.12/738.46
  6. Step 6: Final answer
    x = 578.61

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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.