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Finding the Fourth Proportional to 465.10, 641.64 and 307.90

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Solution

The fourth proportional to 465.10, 641.64 and 307.90 is: 424.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.10 : 641.64 = 307.90 : x
  2. Step 2: Convert to fraction form
    465.10/641.64 = 307.90/x
  3. Step 3: Cross multiply
    465.10x = 641.64 × 307.90
  4. Step 4: Simplify right side
    465.10x = 197,560.96
  5. Step 5: Solve for x
    x = 197,560.96/465.10
  6. Step 6: Final answer
    x = 424.77

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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.