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Finding the Fourth Proportional to 2,621.60, 3,931.38 and 977.78

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Solution

The fourth proportional to 2,621.60, 3,931.38 and 977.78 is: 1,466.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,621.60 : 3,931.38 = 977.78 : x
  2. Step 2: Convert to fraction form
    2,621.60/3,931.38 = 977.78/x
  3. Step 3: Cross multiply
    2,621.60x = 3,931.38 × 977.78
  4. Step 4: Simplify right side
    2,621.60x = 3,844,005.08
  5. Step 5: Solve for x
    x = 3,844,005.08/2,621.60
  6. Step 6: Final answer
    x = 1,466.28

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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.