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Finding the Fourth Proportional to 660.10, 989.59 and 249.01

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Solution

The fourth proportional to 660.10, 989.59 and 249.01 is: 373.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.10 : 989.59 = 249.01 : x
  2. Step 2: Convert to fraction form
    660.10/989.59 = 249.01/x
  3. Step 3: Cross multiply
    660.10x = 989.59 × 249.01
  4. Step 4: Simplify right side
    660.10x = 246,417.81
  5. Step 5: Solve for x
    x = 246,417.81/660.10
  6. Step 6: Final answer
    x = 373.30

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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.