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Finding the Fourth Proportional to 786.47, 1,179.57 and 440.15

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Solution

The fourth proportional to 786.47, 1,179.57 and 440.15 is: 660.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.47 : 1,179.57 = 440.15 : x
  2. Step 2: Convert to fraction form
    786.47/1,179.57 = 440.15/x
  3. Step 3: Cross multiply
    786.47x = 1,179.57 × 440.15
  4. Step 4: Simplify right side
    786.47x = 519,187.74
  5. Step 5: Solve for x
    x = 519,187.74/786.47
  6. Step 6: Final answer
    x = 660.15

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Double scale
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1.5x scale

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.