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Finding the Fourth Proportional to 879.70, 1,320.54 and 555.25

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Solution

The fourth proportional to 879.70, 1,320.54 and 555.25 is: 833.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.70 : 1,320.54 = 555.25 : x
  2. Step 2: Convert to fraction form
    879.70/1,320.54 = 555.25/x
  3. Step 3: Cross multiply
    879.70x = 1,320.54 × 555.25
  4. Step 4: Simplify right side
    879.70x = 733,229.84
  5. Step 5: Solve for x
    x = 733,229.84/879.70
  6. Step 6: Final answer
    x = 833.50

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Double scale
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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.