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Finding the Fourth Proportional to 1,011.67, 1,518.80 and 780.72

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Solution

The fourth proportional to 1,011.67, 1,518.80 and 780.72 is: 1,172.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.67 : 1,518.80 = 780.72 : x
  2. Step 2: Convert to fraction form
    1,011.67/1,518.80 = 780.72/x
  3. Step 3: Cross multiply
    1,011.67x = 1,518.80 × 780.72
  4. Step 4: Simplify right side
    1,011.67x = 1,185,757.54
  5. Step 5: Solve for x
    x = 1,185,757.54/1,011.67
  6. Step 6: Final answer
    x = 1,172.08

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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.