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Finding the Fourth Proportional to 664.66, 916.86 and 402.76

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Solution

The fourth proportional to 664.66, 916.86 and 402.76 is: 555.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.66 : 916.86 = 402.76 : x
  2. Step 2: Convert to fraction form
    664.66/916.86 = 402.76/x
  3. Step 3: Cross multiply
    664.66x = 916.86 × 402.76
  4. Step 4: Simplify right side
    664.66x = 369,274.53
  5. Step 5: Solve for x
    x = 369,274.53/664.66
  6. Step 6: Final answer
    x = 555.58

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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.