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Finding the Fourth Proportional to 1,207.80, 1,666.08 and 710.28

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Solution

The fourth proportional to 1,207.80, 1,666.08 and 710.28 is: 979.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.80 : 1,666.08 = 710.28 : x
  2. Step 2: Convert to fraction form
    1,207.80/1,666.08 = 710.28/x
  3. Step 3: Cross multiply
    1,207.80x = 1,666.08 × 710.28
  4. Step 4: Simplify right side
    1,207.80x = 1,183,383.30
  5. Step 5: Solve for x
    x = 1,183,383.30/1,207.80
  6. Step 6: Final answer
    x = 979.78

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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.