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Finding the Fourth Proportional to 624.40, 936.60 and 478.60

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Solution

The fourth proportional to 624.40, 936.60 and 478.60 is: 717.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.40 : 936.60 = 478.60 : x
  2. Step 2: Convert to fraction form
    624.40/936.60 = 478.60/x
  3. Step 3: Cross multiply
    624.40x = 936.60 × 478.60
  4. Step 4: Simplify right side
    624.40x = 448,256.76
  5. Step 5: Solve for x
    x = 448,256.76/624.40
  6. Step 6: Final answer
    x = 717.90

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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.