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Finding the Fourth Proportional to 848.98, 1,172.31 and 638.79

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Solution

The fourth proportional to 848.98, 1,172.31 and 638.79 is: 882.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.98 : 1,172.31 = 638.79 : x
  2. Step 2: Convert to fraction form
    848.98/1,172.31 = 638.79/x
  3. Step 3: Cross multiply
    848.98x = 1,172.31 × 638.79
  4. Step 4: Simplify right side
    848.98x = 748,859.90
  5. Step 5: Solve for x
    x = 748,859.90/848.98
  6. Step 6: Final answer
    x = 882.07

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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.