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Finding the Fourth Proportional to 1,947.02, 2,920.14 and 776.66

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Solution

The fourth proportional to 1,947.02, 2,920.14 and 776.66 is: 1,164.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.02 : 2,920.14 = 776.66 : x
  2. Step 2: Convert to fraction form
    1,947.02/2,920.14 = 776.66/x
  3. Step 3: Cross multiply
    1,947.02x = 2,920.14 × 776.66
  4. Step 4: Simplify right side
    1,947.02x = 2,267,955.93
  5. Step 5: Solve for x
    x = 2,267,955.93/1,947.02
  6. Step 6: Final answer
    x = 1,164.83

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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.