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Finding the Fourth Proportional to 808.40, 1,212.57 and 565.08

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Solution

The fourth proportional to 808.40, 1,212.57 and 565.08 is: 847.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.40 : 1,212.57 = 565.08 : x
  2. Step 2: Convert to fraction form
    808.40/1,212.57 = 565.08/x
  3. Step 3: Cross multiply
    808.40x = 1,212.57 × 565.08
  4. Step 4: Simplify right side
    808.40x = 685,199.06
  5. Step 5: Solve for x
    x = 685,199.06/808.40
  6. Step 6: Final answer
    x = 847.60

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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.