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Finding the Fourth Proportional to 2,307.78, 3,462.93 and 921.90

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Solution

The fourth proportional to 2,307.78, 3,462.93 and 921.90 is: 1,383.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,307.78 : 3,462.93 = 921.90 : x
  2. Step 2: Convert to fraction form
    2,307.78/3,462.93 = 921.90/x
  3. Step 3: Cross multiply
    2,307.78x = 3,462.93 × 921.90
  4. Step 4: Simplify right side
    2,307.78x = 3,192,475.17
  5. Step 5: Solve for x
    x = 3,192,475.17/2,307.78
  6. Step 6: Final answer
    x = 1,383.35

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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.