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Finding the Fourth Proportional to 780.24, 1,171.40 and 608.02

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Solution

The fourth proportional to 780.24, 1,171.40 and 608.02 is: 912.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.24 : 1,171.40 = 608.02 : x
  2. Step 2: Convert to fraction form
    780.24/1,171.40 = 608.02/x
  3. Step 3: Cross multiply
    780.24x = 1,171.40 × 608.02
  4. Step 4: Simplify right side
    780.24x = 712,228.66
  5. Step 5: Solve for x
    x = 712,228.66/780.24
  6. Step 6: Final answer
    x = 912.83

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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.