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Finding the Fourth Proportional to 789.78, 1,088.75 and 552.99

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Solution

The fourth proportional to 789.78, 1,088.75 and 552.99 is: 762.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.78 : 1,088.75 = 552.99 : x
  2. Step 2: Convert to fraction form
    789.78/1,088.75 = 552.99/x
  3. Step 3: Cross multiply
    789.78x = 1,088.75 × 552.99
  4. Step 4: Simplify right side
    789.78x = 602,067.86
  5. Step 5: Solve for x
    x = 602,067.86/789.78
  6. Step 6: Final answer
    x = 762.32

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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.