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Finding the Fourth Proportional to 487.57, 672.79 and 277.77

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Solution

The fourth proportional to 487.57, 672.79 and 277.77 is: 383.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.57 : 672.79 = 277.77 : x
  2. Step 2: Convert to fraction form
    487.57/672.79 = 277.77/x
  3. Step 3: Cross multiply
    487.57x = 672.79 × 277.77
  4. Step 4: Simplify right side
    487.57x = 186,880.88
  5. Step 5: Solve for x
    x = 186,880.88/487.57
  6. Step 6: Final answer
    x = 383.29

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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.