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Finding the Fourth Proportional to 1,043.90, 1,440.94 and 645.87

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Solution

The fourth proportional to 1,043.90, 1,440.94 and 645.87 is: 891.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.90 : 1,440.94 = 645.87 : x
  2. Step 2: Convert to fraction form
    1,043.90/1,440.94 = 645.87/x
  3. Step 3: Cross multiply
    1,043.90x = 1,440.94 × 645.87
  4. Step 4: Simplify right side
    1,043.90x = 930,652.71
  5. Step 5: Solve for x
    x = 930,652.71/1,043.90
  6. Step 6: Final answer
    x = 891.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.