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Finding the Fourth Proportional to 498.02, 686.40 and 387.02

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Solution

The fourth proportional to 498.02, 686.40 and 387.02 is: 533.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.02 : 686.40 = 387.02 : x
  2. Step 2: Convert to fraction form
    498.02/686.40 = 387.02/x
  3. Step 3: Cross multiply
    498.02x = 686.40 × 387.02
  4. Step 4: Simplify right side
    498.02x = 265,650.53
  5. Step 5: Solve for x
    x = 265,650.53/498.02
  6. Step 6: Final answer
    x = 533.41

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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.