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Finding the Fourth Proportional to 862.65, 1,190.45 and 469.68

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Solution

The fourth proportional to 862.65, 1,190.45 and 469.68 is: 648.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.65 : 1,190.45 = 469.68 : x
  2. Step 2: Convert to fraction form
    862.65/1,190.45 = 469.68/x
  3. Step 3: Cross multiply
    862.65x = 1,190.45 × 469.68
  4. Step 4: Simplify right side
    862.65x = 559,127.27
  5. Step 5: Solve for x
    x = 559,127.27/862.65
  6. Step 6: Final answer
    x = 648.15

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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.