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Finding the Fourth Proportional to 1,989.75, 2,985.72 and 963.75

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Solution

The fourth proportional to 1,989.75, 2,985.72 and 963.75 is: 1,446.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.75 : 2,985.72 = 963.75 : x
  2. Step 2: Convert to fraction form
    1,989.75/2,985.72 = 963.75/x
  3. Step 3: Cross multiply
    1,989.75x = 2,985.72 × 963.75
  4. Step 4: Simplify right side
    1,989.75x = 2,877,487.65
  5. Step 5: Solve for x
    x = 2,877,487.65/1,989.75
  6. Step 6: Final answer
    x = 1,446.16

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1.5x scale

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.