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Finding the Fourth Proportional to 615.24, 922.80 and 420.30

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Solution

The fourth proportional to 615.24, 922.80 and 420.30 is: 630.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.24 : 922.80 = 420.30 : x
  2. Step 2: Convert to fraction form
    615.24/922.80 = 420.30/x
  3. Step 3: Cross multiply
    615.24x = 922.80 × 420.30
  4. Step 4: Simplify right side
    615.24x = 387,852.84
  5. Step 5: Solve for x
    x = 387,852.84/615.24
  6. Step 6: Final answer
    x = 630.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.