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Finding the Fourth Proportional to 1,208.31, 1,666.05 and 788.07

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Solution

The fourth proportional to 1,208.31, 1,666.05 and 788.07 is: 1,086.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.31 : 1,666.05 = 788.07 : x
  2. Step 2: Convert to fraction form
    1,208.31/1,666.05 = 788.07/x
  3. Step 3: Cross multiply
    1,208.31x = 1,666.05 × 788.07
  4. Step 4: Simplify right side
    1,208.31x = 1,312,964.02
  5. Step 5: Solve for x
    x = 1,312,964.02/1,208.31
  6. Step 6: Final answer
    x = 1,086.61

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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.