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Finding the Fourth Proportional to 566.16, 780.98 and 391.20

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Solution

The fourth proportional to 566.16, 780.98 and 391.20 is: 539.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    566.16 : 780.98 = 391.20 : x
  2. Step 2: Convert to fraction form
    566.16/780.98 = 391.20/x
  3. Step 3: Cross multiply
    566.16x = 780.98 × 391.20
  4. Step 4: Simplify right side
    566.16x = 305,519.38
  5. Step 5: Solve for x
    x = 305,519.38/566.16
  6. Step 6: Final answer
    x = 539.63

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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.