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Finding the Fourth Proportional to 1,307.90, 1,961.85 and 383.45

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Solution

The fourth proportional to 1,307.90, 1,961.85 and 383.45 is: 575.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.90 : 1,961.85 = 383.45 : x
  2. Step 2: Convert to fraction form
    1,307.90/1,961.85 = 383.45/x
  3. Step 3: Cross multiply
    1,307.90x = 1,961.85 × 383.45
  4. Step 4: Simplify right side
    1,307.90x = 752,261.57
  5. Step 5: Solve for x
    x = 752,261.57/1,307.90
  6. Step 6: Final answer
    x = 575.17

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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.