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Finding the Fourth Proportional to 1,439.81, 1,988.08 and 968.12

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Solution

The fourth proportional to 1,439.81, 1,988.08 and 968.12 is: 1,336.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.81 : 1,988.08 = 968.12 : x
  2. Step 2: Convert to fraction form
    1,439.81/1,988.08 = 968.12/x
  3. Step 3: Cross multiply
    1,439.81x = 1,988.08 × 968.12
  4. Step 4: Simplify right side
    1,439.81x = 1,924,704.28
  5. Step 5: Solve for x
    x = 1,924,704.28/1,439.81
  6. Step 6: Final answer
    x = 1,336.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.