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Finding the Fourth Proportional to 664.18, 916.69 and 498.14

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Solution

The fourth proportional to 664.18, 916.69 and 498.14 is: 687.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.18 : 916.69 = 498.14 : x
  2. Step 2: Convert to fraction form
    664.18/916.69 = 498.14/x
  3. Step 3: Cross multiply
    664.18x = 916.69 × 498.14
  4. Step 4: Simplify right side
    664.18x = 456,639.96
  5. Step 5: Solve for x
    x = 456,639.96/664.18
  6. Step 6: Final answer
    x = 687.52

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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.