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Finding the Fourth Proportional to 664.38, 916.70 and 402.35

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Solution

The fourth proportional to 664.38, 916.70 and 402.35 is: 555.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.38 : 916.70 = 402.35 : x
  2. Step 2: Convert to fraction form
    664.38/916.70 = 402.35/x
  3. Step 3: Cross multiply
    664.38x = 916.70 × 402.35
  4. Step 4: Simplify right side
    664.38x = 368,827.65
  5. Step 5: Solve for x
    x = 368,827.65/664.38
  6. Step 6: Final answer
    x = 555.15

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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.