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Finding the Fourth Proportional to 713.04, 983.16 and 661.20

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Solution

The fourth proportional to 713.04, 983.16 and 661.20 is: 911.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.04 : 983.16 = 661.20 : x
  2. Step 2: Convert to fraction form
    713.04/983.16 = 661.20/x
  3. Step 3: Cross multiply
    713.04x = 983.16 × 661.20
  4. Step 4: Simplify right side
    713.04x = 650,065.39
  5. Step 5: Solve for x
    x = 650,065.39/713.04
  6. Step 6: Final answer
    x = 911.68

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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.