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Finding the Fourth Proportional to 1,420.93, 2,131.53 and 543.43

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Solution

The fourth proportional to 1,420.93, 2,131.53 and 543.43 is: 815.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.93 : 2,131.53 = 543.43 : x
  2. Step 2: Convert to fraction form
    1,420.93/2,131.53 = 543.43/x
  3. Step 3: Cross multiply
    1,420.93x = 2,131.53 × 543.43
  4. Step 4: Simplify right side
    1,420.93x = 1,158,337.35
  5. Step 5: Solve for x
    x = 1,158,337.35/1,420.93
  6. Step 6: Final answer
    x = 815.20

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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.