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Finding the Fourth Proportional to 1,009.68, 1,392.86 and 616.84

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Solution

The fourth proportional to 1,009.68, 1,392.86 and 616.84 is: 850.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.68 : 1,392.86 = 616.84 : x
  2. Step 2: Convert to fraction form
    1,009.68/1,392.86 = 616.84/x
  3. Step 3: Cross multiply
    1,009.68x = 1,392.86 × 616.84
  4. Step 4: Simplify right side
    1,009.68x = 859,171.76
  5. Step 5: Solve for x
    x = 859,171.76/1,009.68
  6. Step 6: Final answer
    x = 850.93

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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.