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Finding the Fourth Proportional to 710.79, 1,068.21 and 661.56

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Solution

The fourth proportional to 710.79, 1,068.21 and 661.56 is: 994.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.79 : 1,068.21 = 661.56 : x
  2. Step 2: Convert to fraction form
    710.79/1,068.21 = 661.56/x
  3. Step 3: Cross multiply
    710.79x = 1,068.21 × 661.56
  4. Step 4: Simplify right side
    710.79x = 706,685.01
  5. Step 5: Solve for x
    x = 706,685.01/710.79
  6. Step 6: Final answer
    x = 994.22

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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.