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Finding the Fourth Proportional to 1,316.95, 1,976.94 and 769.52

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Solution

The fourth proportional to 1,316.95, 1,976.94 and 769.52 is: 1,155.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.95 : 1,976.94 = 769.52 : x
  2. Step 2: Convert to fraction form
    1,316.95/1,976.94 = 769.52/x
  3. Step 3: Cross multiply
    1,316.95x = 1,976.94 × 769.52
  4. Step 4: Simplify right side
    1,316.95x = 1,521,299.81
  5. Step 5: Solve for x
    x = 1,521,299.81/1,316.95
  6. Step 6: Final answer
    x = 1,155.17

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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.