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Finding the Fourth Proportional to 660.48, 989.76 and 478.26

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Solution

The fourth proportional to 660.48, 989.76 and 478.26 is: 716.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.48 : 989.76 = 478.26 : x
  2. Step 2: Convert to fraction form
    660.48/989.76 = 478.26/x
  3. Step 3: Cross multiply
    660.48x = 989.76 × 478.26
  4. Step 4: Simplify right side
    660.48x = 473,362.62
  5. Step 5: Solve for x
    x = 473,362.62/660.48
  6. Step 6: Final answer
    x = 716.69

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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.