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Finding the Fourth Proportional to 1,207.78, 1,666.77 and 676.63

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Solution

The fourth proportional to 1,207.78, 1,666.77 and 676.63 is: 933.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.78 : 1,666.77 = 676.63 : x
  2. Step 2: Convert to fraction form
    1,207.78/1,666.77 = 676.63/x
  3. Step 3: Cross multiply
    1,207.78x = 1,666.77 × 676.63
  4. Step 4: Simplify right side
    1,207.78x = 1,127,786.13
  5. Step 5: Solve for x
    x = 1,127,786.13/1,207.78
  6. Step 6: Final answer
    x = 933.77

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Half scale
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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.