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Finding the Fourth Proportional to 1,620.64, 2,429.60 and 753.76

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Solution

The fourth proportional to 1,620.64, 2,429.60 and 753.76 is: 1,130.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.64 : 2,429.60 = 753.76 : x
  2. Step 2: Convert to fraction form
    1,620.64/2,429.60 = 753.76/x
  3. Step 3: Cross multiply
    1,620.64x = 2,429.60 × 753.76
  4. Step 4: Simplify right side
    1,620.64x = 1,831,335.30
  5. Step 5: Solve for x
    x = 1,831,335.30/1,620.64
  6. Step 6: Final answer
    x = 1,130.01

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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.