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Finding the Fourth Proportional to 909.80, 1,365.78 and 585.80

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Solution

The fourth proportional to 909.80, 1,365.78 and 585.80 is: 879.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.80 : 1,365.78 = 585.80 : x
  2. Step 2: Convert to fraction form
    909.80/1,365.78 = 585.80/x
  3. Step 3: Cross multiply
    909.80x = 1,365.78 × 585.80
  4. Step 4: Simplify right side
    909.80x = 800,073.92
  5. Step 5: Solve for x
    x = 800,073.92/909.80
  6. Step 6: Final answer
    x = 879.40

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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.