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Finding the Fourth Proportional to 783.94, 1,176.08 and 669.18

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Solution

The fourth proportional to 783.94, 1,176.08 and 669.18 is: 1,003.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.94 : 1,176.08 = 669.18 : x
  2. Step 2: Convert to fraction form
    783.94/1,176.08 = 669.18/x
  3. Step 3: Cross multiply
    783.94x = 1,176.08 × 669.18
  4. Step 4: Simplify right side
    783.94x = 787,009.21
  5. Step 5: Solve for x
    x = 787,009.21/783.94
  6. Step 6: Final answer
    x = 1,003.92

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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.