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Finding the Fourth Proportional to 786.70, 1,180.05 and 543.16

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Solution

The fourth proportional to 786.70, 1,180.05 and 543.16 is: 814.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.70 : 1,180.05 = 543.16 : x
  2. Step 2: Convert to fraction form
    786.70/1,180.05 = 543.16/x
  3. Step 3: Cross multiply
    786.70x = 1,180.05 × 543.16
  4. Step 4: Simplify right side
    786.70x = 640,955.96
  5. Step 5: Solve for x
    x = 640,955.96/786.70
  6. Step 6: Final answer
    x = 814.74

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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.