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Finding the Fourth Proportional to 743.86, 1,028.73 and 644.39

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Solution

The fourth proportional to 743.86, 1,028.73 and 644.39 is: 891.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.86 : 1,028.73 = 644.39 : x
  2. Step 2: Convert to fraction form
    743.86/1,028.73 = 644.39/x
  3. Step 3: Cross multiply
    743.86x = 1,028.73 × 644.39
  4. Step 4: Simplify right side
    743.86x = 662,904.46
  5. Step 5: Solve for x
    x = 662,904.46/743.86
  6. Step 6: Final answer
    x = 891.17

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1.5x scale

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.