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Finding the Fourth Proportional to 1,307.79, 1,961.69 and 320.61

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Solution

The fourth proportional to 1,307.79, 1,961.69 and 320.61 is: 480.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.79 : 1,961.69 = 320.61 : x
  2. Step 2: Convert to fraction form
    1,307.79/1,961.69 = 320.61/x
  3. Step 3: Cross multiply
    1,307.79x = 1,961.69 × 320.61
  4. Step 4: Simplify right side
    1,307.79x = 628,937.43
  5. Step 5: Solve for x
    x = 628,937.43/1,307.79
  6. Step 6: Final answer
    x = 480.92

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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.