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Finding the Fourth Proportional to 1,385.43, 2,076.76 and 645.81

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Solution

The fourth proportional to 1,385.43, 2,076.76 and 645.81 is: 968.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.43 : 2,076.76 = 645.81 : x
  2. Step 2: Convert to fraction form
    1,385.43/2,076.76 = 645.81/x
  3. Step 3: Cross multiply
    1,385.43x = 2,076.76 × 645.81
  4. Step 4: Simplify right side
    1,385.43x = 1,341,192.38
  5. Step 5: Solve for x
    x = 1,341,192.38/1,385.43
  6. Step 6: Final answer
    x = 968.07

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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.