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Finding the Fourth Proportional to 1,221.88, 1,686.36 and 750.07

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Solution

The fourth proportional to 1,221.88, 1,686.36 and 750.07 is: 1,035.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.88 : 1,686.36 = 750.07 : x
  2. Step 2: Convert to fraction form
    1,221.88/1,686.36 = 750.07/x
  3. Step 3: Cross multiply
    1,221.88x = 1,686.36 × 750.07
  4. Step 4: Simplify right side
    1,221.88x = 1,264,888.05
  5. Step 5: Solve for x
    x = 1,264,888.05/1,221.88
  6. Step 6: Final answer
    x = 1,035.20

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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.