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Finding the Fourth Proportional to 1,420.64, 2,130.21 and 446.48

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Solution

The fourth proportional to 1,420.64, 2,130.21 and 446.48 is: 669.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.64 : 2,130.21 = 446.48 : x
  2. Step 2: Convert to fraction form
    1,420.64/2,130.21 = 446.48/x
  3. Step 3: Cross multiply
    1,420.64x = 2,130.21 × 446.48
  4. Step 4: Simplify right side
    1,420.64x = 951,096.16
  5. Step 5: Solve for x
    x = 951,096.16/1,420.64
  6. Step 6: Final answer
    x = 669.48

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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.