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Finding the Fourth Proportional to 1,289.02, 1,931.79 and 638.32

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Solution

The fourth proportional to 1,289.02, 1,931.79 and 638.32 is: 956.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.02 : 1,931.79 = 638.32 : x
  2. Step 2: Convert to fraction form
    1,289.02/1,931.79 = 638.32/x
  3. Step 3: Cross multiply
    1,289.02x = 1,931.79 × 638.32
  4. Step 4: Simplify right side
    1,289.02x = 1,233,100.19
  5. Step 5: Solve for x
    x = 1,233,100.19/1,289.02
  6. Step 6: Final answer
    x = 956.62

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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.