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Finding the Fourth Proportional to 1,142.43, 1,713.63 and 320.70

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Solution

The fourth proportional to 1,142.43, 1,713.63 and 320.70 is: 481.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.43 : 1,713.63 = 320.70 : x
  2. Step 2: Convert to fraction form
    1,142.43/1,713.63 = 320.70/x
  3. Step 3: Cross multiply
    1,142.43x = 1,713.63 × 320.70
  4. Step 4: Simplify right side
    1,142.43x = 549,561.14
  5. Step 5: Solve for x
    x = 549,561.14/1,142.43
  6. Step 6: Final answer
    x = 481.05

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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.