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Finding the Fourth Proportional to 808.86, 1,212.36 and 530.85

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Solution

The fourth proportional to 808.86, 1,212.36 and 530.85 is: 795.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.86 : 1,212.36 = 530.85 : x
  2. Step 2: Convert to fraction form
    808.86/1,212.36 = 530.85/x
  3. Step 3: Cross multiply
    808.86x = 1,212.36 × 530.85
  4. Step 4: Simplify right side
    808.86x = 643,581.31
  5. Step 5: Solve for x
    x = 643,581.31/808.86
  6. Step 6: Final answer
    x = 795.66

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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.