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Finding the Fourth Proportional to 660.23, 989.64 and 313.39

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Solution

The fourth proportional to 660.23, 989.64 and 313.39 is: 469.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.23 : 989.64 = 313.39 : x
  2. Step 2: Convert to fraction form
    660.23/989.64 = 313.39/x
  3. Step 3: Cross multiply
    660.23x = 989.64 × 313.39
  4. Step 4: Simplify right side
    660.23x = 310,148.18
  5. Step 5: Solve for x
    x = 310,148.18/660.23
  6. Step 6: Final answer
    x = 469.76

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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.