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Finding the Fourth Proportional to 660.16, 989.63 and 289.58

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Solution

The fourth proportional to 660.16, 989.63 and 289.58 is: 434.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.16 : 989.63 = 289.58 : x
  2. Step 2: Convert to fraction form
    660.16/989.63 = 289.58/x
  3. Step 3: Cross multiply
    660.16x = 989.63 × 289.58
  4. Step 4: Simplify right side
    660.16x = 286,578.08
  5. Step 5: Solve for x
    x = 286,578.08/660.16
  6. Step 6: Final answer
    x = 434.11

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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.