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Finding the Fourth Proportional to 918.98, 1,379.34 and 508.58

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Solution

The fourth proportional to 918.98, 1,379.34 and 508.58 is: 763.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.98 : 1,379.34 = 508.58 : x
  2. Step 2: Convert to fraction form
    918.98/1,379.34 = 508.58/x
  3. Step 3: Cross multiply
    918.98x = 1,379.34 × 508.58
  4. Step 4: Simplify right side
    918.98x = 701,504.74
  5. Step 5: Solve for x
    x = 701,504.74/918.98
  6. Step 6: Final answer
    x = 763.35

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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.