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Finding the Fourth Proportional to 1,307.69, 1,961.31 and 383.23

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Solution

The fourth proportional to 1,307.69, 1,961.31 and 383.23 is: 574.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.69 : 1,961.31 = 383.23 : x
  2. Step 2: Convert to fraction form
    1,307.69/1,961.31 = 383.23/x
  3. Step 3: Cross multiply
    1,307.69x = 1,961.31 × 383.23
  4. Step 4: Simplify right side
    1,307.69x = 751,621.11
  5. Step 5: Solve for x
    x = 751,621.11/1,307.69
  6. Step 6: Final answer
    x = 574.77

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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.