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Finding the Fourth Proportional to 487.57, 672.54 and 389.29

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Solution

The fourth proportional to 487.57, 672.54 and 389.29 is: 536.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.57 : 672.54 = 389.29 : x
  2. Step 2: Convert to fraction form
    487.57/672.54 = 389.29/x
  3. Step 3: Cross multiply
    487.57x = 672.54 × 389.29
  4. Step 4: Simplify right side
    487.57x = 261,813.10
  5. Step 5: Solve for x
    x = 261,813.10/487.57
  6. Step 6: Final answer
    x = 536.98

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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.