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Finding the Fourth Proportional to 1,009.20, 1,513.80 and 768.72

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Solution

The fourth proportional to 1,009.20, 1,513.80 and 768.72 is: 1,153.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.20 : 1,513.80 = 768.72 : x
  2. Step 2: Convert to fraction form
    1,009.20/1,513.80 = 768.72/x
  3. Step 3: Cross multiply
    1,009.20x = 1,513.80 × 768.72
  4. Step 4: Simplify right side
    1,009.20x = 1,163,688.34
  5. Step 5: Solve for x
    x = 1,163,688.34/1,009.20
  6. Step 6: Final answer
    x = 1,153.08

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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.