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Finding the Fourth Proportional to 880.49, 1,320.90 and 393.54

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Solution

The fourth proportional to 880.49, 1,320.90 and 393.54 is: 590.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.49 : 1,320.90 = 393.54 : x
  2. Step 2: Convert to fraction form
    880.49/1,320.90 = 393.54/x
  3. Step 3: Cross multiply
    880.49x = 1,320.90 × 393.54
  4. Step 4: Simplify right side
    880.49x = 519,830.20
  5. Step 5: Solve for x
    x = 519,830.20/880.49
  6. Step 6: Final answer
    x = 590.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.