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Finding the Fourth Proportional to 456.50, 630.21 and 307.90

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Solution

The fourth proportional to 456.50, 630.21 and 307.90 is: 425.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.50 : 630.21 = 307.90 : x
  2. Step 2: Convert to fraction form
    456.50/630.21 = 307.90/x
  3. Step 3: Cross multiply
    456.50x = 630.21 × 307.90
  4. Step 4: Simplify right side
    456.50x = 194,043.60
  5. Step 5: Solve for x
    x = 194,043.60/456.50
  6. Step 6: Final answer
    x = 425.07

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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.