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Finding the Fourth Proportional to 713.94, 1,064.64 and 661.02

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Solution

The fourth proportional to 713.94, 1,064.64 and 661.02 is: 985.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.94 : 1,064.64 = 661.02 : x
  2. Step 2: Convert to fraction form
    713.94/1,064.64 = 661.02/x
  3. Step 3: Cross multiply
    713.94x = 1,064.64 × 661.02
  4. Step 4: Simplify right side
    713.94x = 703,748.33
  5. Step 5: Solve for x
    x = 703,748.33/713.94
  6. Step 6: Final answer
    x = 985.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.