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Finding the Fourth Proportional to 777.58, 1,072.75 and 497.75

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Solution

The fourth proportional to 777.58, 1,072.75 and 497.75 is: 686.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.58 : 1,072.75 = 497.75 : x
  2. Step 2: Convert to fraction form
    777.58/1,072.75 = 497.75/x
  3. Step 3: Cross multiply
    777.58x = 1,072.75 × 497.75
  4. Step 4: Simplify right side
    777.58x = 533,961.31
  5. Step 5: Solve for x
    x = 533,961.31/777.58
  6. Step 6: Final answer
    x = 686.70

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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.