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Finding the Fourth Proportional to 880.50, 1,320.78 and 393.54

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Solution

The fourth proportional to 880.50, 1,320.78 and 393.54 is: 590.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.50 : 1,320.78 = 393.54 : x
  2. Step 2: Convert to fraction form
    880.50/1,320.78 = 393.54/x
  3. Step 3: Cross multiply
    880.50x = 1,320.78 × 393.54
  4. Step 4: Simplify right side
    880.50x = 519,779.76
  5. Step 5: Solve for x
    x = 519,779.76/880.50
  6. Step 6: Final answer
    x = 590.32

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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.