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Finding the Fourth Proportional to 1,977.16, 2,965.74 and 678.62

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Solution

The fourth proportional to 1,977.16, 2,965.74 and 678.62 is: 1,017.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,977.16 : 2,965.74 = 678.62 : x
  2. Step 2: Convert to fraction form
    1,977.16/2,965.74 = 678.62/x
  3. Step 3: Cross multiply
    1,977.16x = 2,965.74 × 678.62
  4. Step 4: Simplify right side
    1,977.16x = 2,012,610.48
  5. Step 5: Solve for x
    x = 2,012,610.48/1,977.16
  6. Step 6: Final answer
    x = 1,017.93

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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.