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Finding the Fourth Proportional to 784.74, 1,177.16 and 640.16

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Solution

The fourth proportional to 784.74, 1,177.16 and 640.16 is: 960.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.74 : 1,177.16 = 640.16 : x
  2. Step 2: Convert to fraction form
    784.74/1,177.16 = 640.16/x
  3. Step 3: Cross multiply
    784.74x = 1,177.16 × 640.16
  4. Step 4: Simplify right side
    784.74x = 753,570.75
  5. Step 5: Solve for x
    x = 753,570.75/784.74
  6. Step 6: Final answer
    x = 960.28

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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.