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Finding the Fourth Proportional to 1,242.20, 1,864.65 and 695.45

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Solution

The fourth proportional to 1,242.20, 1,864.65 and 695.45 is: 1,043.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.20 : 1,864.65 = 695.45 : x
  2. Step 2: Convert to fraction form
    1,242.20/1,864.65 = 695.45/x
  3. Step 3: Cross multiply
    1,242.20x = 1,864.65 × 695.45
  4. Step 4: Simplify right side
    1,242.20x = 1,296,770.84
  5. Step 5: Solve for x
    x = 1,296,770.84/1,242.20
  6. Step 6: Final answer
    x = 1,043.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.