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Finding the Fourth Proportional to 783.73, 1,168.95 and 661.14

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Solution

The fourth proportional to 783.73, 1,168.95 and 661.14 is: 986.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.73 : 1,168.95 = 661.14 : x
  2. Step 2: Convert to fraction form
    783.73/1,168.95 = 661.14/x
  3. Step 3: Cross multiply
    783.73x = 1,168.95 × 661.14
  4. Step 4: Simplify right side
    783.73x = 772,839.60
  5. Step 5: Solve for x
    x = 772,839.60/783.73
  6. Step 6: Final answer
    x = 986.10

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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.