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Finding the Fourth Proportional to 707.79, 1,061.55 and 245.87

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Solution

The fourth proportional to 707.79, 1,061.55 and 245.87 is: 368.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.79 : 1,061.55 = 245.87 : x
  2. Step 2: Convert to fraction form
    707.79/1,061.55 = 245.87/x
  3. Step 3: Cross multiply
    707.79x = 1,061.55 × 245.87
  4. Step 4: Simplify right side
    707.79x = 261,003.30
  5. Step 5: Solve for x
    x = 261,003.30/707.79
  6. Step 6: Final answer
    x = 368.76

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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.