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Finding the Fourth Proportional to 780.76, 1,169.08 and 472.20

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Solution

The fourth proportional to 780.76, 1,169.08 and 472.20 is: 707.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.76 : 1,169.08 = 472.20 : x
  2. Step 2: Convert to fraction form
    780.76/1,169.08 = 472.20/x
  3. Step 3: Cross multiply
    780.76x = 1,169.08 × 472.20
  4. Step 4: Simplify right side
    780.76x = 552,039.58
  5. Step 5: Solve for x
    x = 552,039.58/780.76
  6. Step 6: Final answer
    x = 707.05

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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.