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Finding the Fourth Proportional to 922.93, 1,385 and 490.39

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Solution

The fourth proportional to 922.93, 1,385 and 490.39 is: 735.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.93 : 1,385 = 490.39 : x
  2. Step 2: Convert to fraction form
    922.93/1,385 = 490.39/x
  3. Step 3: Cross multiply
    922.93x = 1,385 × 490.39
  4. Step 4: Simplify right side
    922.93x = 679,190.15
  5. Step 5: Solve for x
    x = 679,190.15/922.93
  6. Step 6: Final answer
    x = 735.91

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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.