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Finding the Fourth Proportional to 781.79, 1,171.97 and 607.50

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Solution

The fourth proportional to 781.79, 1,171.97 and 607.50 is: 910.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.79 : 1,171.97 = 607.50 : x
  2. Step 2: Convert to fraction form
    781.79/1,171.97 = 607.50/x
  3. Step 3: Cross multiply
    781.79x = 1,171.97 × 607.50
  4. Step 4: Simplify right side
    781.79x = 711,971.02
  5. Step 5: Solve for x
    x = 711,971.02/781.79
  6. Step 6: Final answer
    x = 910.70

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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.