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Finding the Fourth Proportional to 1,405.49, 2,108.64 and 431.74

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Solution

The fourth proportional to 1,405.49, 2,108.64 and 431.74 is: 647.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.49 : 2,108.64 = 431.74 : x
  2. Step 2: Convert to fraction form
    1,405.49/2,108.64 = 431.74/x
  3. Step 3: Cross multiply
    1,405.49x = 2,108.64 × 431.74
  4. Step 4: Simplify right side
    1,405.49x = 910,373.69
  5. Step 5: Solve for x
    x = 910,373.69/1,405.49
  6. Step 6: Final answer
    x = 647.73

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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.