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Finding the Fourth Proportional to 1,370.76, 2,056 and 640.48

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Solution

The fourth proportional to 1,370.76, 2,056 and 640.48 is: 960.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.76 : 2,056 = 640.48 : x
  2. Step 2: Convert to fraction form
    1,370.76/2,056 = 640.48/x
  3. Step 3: Cross multiply
    1,370.76x = 2,056 × 640.48
  4. Step 4: Simplify right side
    1,370.76x = 1,316,826.88
  5. Step 5: Solve for x
    x = 1,316,826.88/1,370.76
  6. Step 6: Final answer
    x = 960.65

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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.