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Finding the Fourth Proportional to 1,418.99, 2,127.89 and 431.48

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Solution

The fourth proportional to 1,418.99, 2,127.89 and 431.48 is: 647.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.99 : 2,127.89 = 431.48 : x
  2. Step 2: Convert to fraction form
    1,418.99/2,127.89 = 431.48/x
  3. Step 3: Cross multiply
    1,418.99x = 2,127.89 × 431.48
  4. Step 4: Simplify right side
    1,418.99x = 918,148.38
  5. Step 5: Solve for x
    x = 918,148.38/1,418.99
  6. Step 6: Final answer
    x = 647.05

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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.