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Finding the Fourth Proportional to 714.90, 1,072.80 and 618.08

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Solution

The fourth proportional to 714.90, 1,072.80 and 618.08 is: 927.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.90 : 1,072.80 = 618.08 : x
  2. Step 2: Convert to fraction form
    714.90/1,072.80 = 618.08/x
  3. Step 3: Cross multiply
    714.90x = 1,072.80 × 618.08
  4. Step 4: Simplify right side
    714.90x = 663,076.22
  5. Step 5: Solve for x
    x = 663,076.22/714.90
  6. Step 6: Final answer
    x = 927.51

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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.