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Finding the Fourth Proportional to 780.15, 1,168.74 and 664.32

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Solution

The fourth proportional to 780.15, 1,168.74 and 664.32 is: 995.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.15 : 1,168.74 = 664.32 : x
  2. Step 2: Convert to fraction form
    780.15/1,168.74 = 664.32/x
  3. Step 3: Cross multiply
    780.15x = 1,168.74 × 664.32
  4. Step 4: Simplify right side
    780.15x = 776,417.36
  5. Step 5: Solve for x
    x = 776,417.36/780.15
  6. Step 6: Final answer
    x = 995.22

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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.