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Finding the Fourth Proportional to 776.97, 1,072.09 and 497.45

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Solution

The fourth proportional to 776.97, 1,072.09 and 497.45 is: 686.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.97 : 1,072.09 = 497.45 : x
  2. Step 2: Convert to fraction form
    776.97/1,072.09 = 497.45/x
  3. Step 3: Cross multiply
    776.97x = 1,072.09 × 497.45
  4. Step 4: Simplify right side
    776.97x = 533,311.17
  5. Step 5: Solve for x
    x = 533,311.17/776.97
  6. Step 6: Final answer
    x = 686.40

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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.