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Finding the Fourth Proportional to 1,307.69, 1,961.37 and 370.61

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Solution

The fourth proportional to 1,307.69, 1,961.37 and 370.61 is: 555.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.69 : 1,961.37 = 370.61 : x
  2. Step 2: Convert to fraction form
    1,307.69/1,961.37 = 370.61/x
  3. Step 3: Cross multiply
    1,307.69x = 1,961.37 × 370.61
  4. Step 4: Simplify right side
    1,307.69x = 726,893.53
  5. Step 5: Solve for x
    x = 726,893.53/1,307.69
  6. Step 6: Final answer
    x = 555.86

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1.5x scale

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.