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Finding the Fourth Proportional to 714.84, 1,069.96 and 647.48

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Solution

The fourth proportional to 714.84, 1,069.96 and 647.48 is: 969.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.84 : 1,069.96 = 647.48 : x
  2. Step 2: Convert to fraction form
    714.84/1,069.96 = 647.48/x
  3. Step 3: Cross multiply
    714.84x = 1,069.96 × 647.48
  4. Step 4: Simplify right side
    714.84x = 692,777.70
  5. Step 5: Solve for x
    x = 692,777.70/714.84
  6. Step 6: Final answer
    x = 969.14

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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.