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Finding the Fourth Proportional to 569.60, 786 and 320.90

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Solution

The fourth proportional to 569.60, 786 and 320.90 is: 442.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.60 : 786 = 320.90 : x
  2. Step 2: Convert to fraction form
    569.60/786 = 320.90/x
  3. Step 3: Cross multiply
    569.60x = 786 × 320.90
  4. Step 4: Simplify right side
    569.60x = 252,227.40
  5. Step 5: Solve for x
    x = 252,227.40/569.60
  6. Step 6: Final answer
    x = 442.81

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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.