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Finding the Fourth Proportional to 738.43, 1,018.87 and 427.75

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Solution

The fourth proportional to 738.43, 1,018.87 and 427.75 is: 590.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.43 : 1,018.87 = 427.75 : x
  2. Step 2: Convert to fraction form
    738.43/1,018.87 = 427.75/x
  3. Step 3: Cross multiply
    738.43x = 1,018.87 × 427.75
  4. Step 4: Simplify right side
    738.43x = 435,821.64
  5. Step 5: Solve for x
    x = 435,821.64/738.43
  6. Step 6: Final answer
    x = 590.20

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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.