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Finding the Fourth Proportional to 3,280.64, 4,921.77 and 972.14

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Solution

The fourth proportional to 3,280.64, 4,921.77 and 972.14 is: 1,458.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280.64 : 4,921.77 = 972.14 : x
  2. Step 2: Convert to fraction form
    3,280.64/4,921.77 = 972.14/x
  3. Step 3: Cross multiply
    3,280.64x = 4,921.77 × 972.14
  4. Step 4: Simplify right side
    3,280.64x = 4,784,649.49
  5. Step 5: Solve for x
    x = 4,784,649.49/3,280.64
  6. Step 6: Final answer
    x = 1,458.45

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1.5x scale

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.