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Finding the Fourth Proportional to 1,308.96, 1,964.04 and 487.92

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Solution

The fourth proportional to 1,308.96, 1,964.04 and 487.92 is: 732.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.96 : 1,964.04 = 487.92 : x
  2. Step 2: Convert to fraction form
    1,308.96/1,964.04 = 487.92/x
  3. Step 3: Cross multiply
    1,308.96x = 1,964.04 × 487.92
  4. Step 4: Simplify right side
    1,308.96x = 958,294.40
  5. Step 5: Solve for x
    x = 958,294.40/1,308.96
  6. Step 6: Final answer
    x = 732.10

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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.