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Finding the Fourth Proportional to 783.31, 1,176.15 and 492.62

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Solution

The fourth proportional to 783.31, 1,176.15 and 492.62 is: 739.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.31 : 1,176.15 = 492.62 : x
  2. Step 2: Convert to fraction form
    783.31/1,176.15 = 492.62/x
  3. Step 3: Cross multiply
    783.31x = 1,176.15 × 492.62
  4. Step 4: Simplify right side
    783.31x = 579,395.01
  5. Step 5: Solve for x
    x = 579,395.01/783.31
  6. Step 6: Final answer
    x = 739.68

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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.