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Finding the Fourth Proportional to 552.78, 829.32 and 390.78

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Solution

The fourth proportional to 552.78, 829.32 and 390.78 is: 586.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.78 : 829.32 = 390.78 : x
  2. Step 2: Convert to fraction form
    552.78/829.32 = 390.78/x
  3. Step 3: Cross multiply
    552.78x = 829.32 × 390.78
  4. Step 4: Simplify right side
    552.78x = 324,081.67
  5. Step 5: Solve for x
    x = 324,081.67/552.78
  6. Step 6: Final answer
    x = 586.28

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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.