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Finding the Fourth Proportional to 922.78, 1,383.63 and 345.70

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Solution

The fourth proportional to 922.78, 1,383.63 and 345.70 is: 518.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.78 : 1,383.63 = 345.70 : x
  2. Step 2: Convert to fraction form
    922.78/1,383.63 = 345.70/x
  3. Step 3: Cross multiply
    922.78x = 1,383.63 × 345.70
  4. Step 4: Simplify right side
    922.78x = 478,320.89
  5. Step 5: Solve for x
    x = 478,320.89/922.78
  6. Step 6: Final answer
    x = 518.35

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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.