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Finding the Fourth Proportional to 498.56, 688.23 and 387.77

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Solution

The fourth proportional to 498.56, 688.23 and 387.77 is: 535.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.56 : 688.23 = 387.77 : x
  2. Step 2: Convert to fraction form
    498.56/688.23 = 387.77/x
  3. Step 3: Cross multiply
    498.56x = 688.23 × 387.77
  4. Step 4: Simplify right side
    498.56x = 266,871.51
  5. Step 5: Solve for x
    x = 266,871.51/498.56
  6. Step 6: Final answer
    x = 535.29

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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.