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Finding the Fourth Proportional to 712.84, 1,069.80 and 469.28

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Solution

The fourth proportional to 712.84, 1,069.80 and 469.28 is: 704.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.84 : 1,069.80 = 469.28 : x
  2. Step 2: Convert to fraction form
    712.84/1,069.80 = 469.28/x
  3. Step 3: Cross multiply
    712.84x = 1,069.80 × 469.28
  4. Step 4: Simplify right side
    712.84x = 502,035.74
  5. Step 5: Solve for x
    x = 502,035.74/712.84
  6. Step 6: Final answer
    x = 704.28

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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.