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Finding the Fourth Proportional to 1,208.12, 1,666.37 and 875.81

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Solution

The fourth proportional to 1,208.12, 1,666.37 and 875.81 is: 1,208.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.12 : 1,666.37 = 875.81 : x
  2. Step 2: Convert to fraction form
    1,208.12/1,666.37 = 875.81/x
  3. Step 3: Cross multiply
    1,208.12x = 1,666.37 × 875.81
  4. Step 4: Simplify right side
    1,208.12x = 1,459,429.87
  5. Step 5: Solve for x
    x = 1,459,429.87/1,208.12
  6. Step 6: Final answer
    x = 1,208.02

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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.