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Finding the Fourth Proportional to 1,207.84, 1,666.86 and 742.09

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Solution

The fourth proportional to 1,207.84, 1,666.86 and 742.09 is: 1,024.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.84 : 1,666.86 = 742.09 : x
  2. Step 2: Convert to fraction form
    1,207.84/1,666.86 = 742.09/x
  3. Step 3: Cross multiply
    1,207.84x = 1,666.86 × 742.09
  4. Step 4: Simplify right side
    1,207.84x = 1,236,960.14
  5. Step 5: Solve for x
    x = 1,236,960.14/1,207.84
  6. Step 6: Final answer
    x = 1,024.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.