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Finding the Fourth Proportional to 842.15, 1,162.25 and 469.19

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Solution

The fourth proportional to 842.15, 1,162.25 and 469.19 is: 647.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.15 : 1,162.25 = 469.19 : x
  2. Step 2: Convert to fraction form
    842.15/1,162.25 = 469.19/x
  3. Step 3: Cross multiply
    842.15x = 1,162.25 × 469.19
  4. Step 4: Simplify right side
    842.15x = 545,317.25
  5. Step 5: Solve for x
    x = 545,317.25/842.15
  6. Step 6: Final answer
    x = 647.53

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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.