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Finding the Fourth Proportional to 786.72, 1,176.48 and 570

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Solution

The fourth proportional to 786.72, 1,176.48 and 570 is: 852.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.72 : 1,176.48 = 570 : x
  2. Step 2: Convert to fraction form
    786.72/1,176.48 = 570/x
  3. Step 3: Cross multiply
    786.72x = 1,176.48 × 570
  4. Step 4: Simplify right side
    786.72x = 670,593.60
  5. Step 5: Solve for x
    x = 670,593.60/786.72
  6. Step 6: Final answer
    x = 852.39

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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.