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Finding the Fourth Proportional to 1,009.84, 1,392 and 714.64

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Solution

The fourth proportional to 1,009.84, 1,392 and 714.64 is: 985.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.84 : 1,392 = 714.64 : x
  2. Step 2: Convert to fraction form
    1,009.84/1,392 = 714.64/x
  3. Step 3: Cross multiply
    1,009.84x = 1,392 × 714.64
  4. Step 4: Simplify right side
    1,009.84x = 994,778.88
  5. Step 5: Solve for x
    x = 994,778.88/1,009.84
  6. Step 6: Final answer
    x = 985.09

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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.