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Finding the Fourth Proportional to 688.75, 1,033 and 277.78

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Solution

The fourth proportional to 688.75, 1,033 and 277.78 is: 416.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.75 : 1,033 = 277.78 : x
  2. Step 2: Convert to fraction form
    688.75/1,033 = 277.78/x
  3. Step 3: Cross multiply
    688.75x = 1,033 × 277.78
  4. Step 4: Simplify right side
    688.75x = 286,946.74
  5. Step 5: Solve for x
    x = 286,946.74/688.75
  6. Step 6: Final answer
    x = 416.62

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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.