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Finding the Fourth Proportional to 1,420.58, 2,130.54 and 446.45

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Solution

The fourth proportional to 1,420.58, 2,130.54 and 446.45 is: 669.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.58 : 2,130.54 = 446.45 : x
  2. Step 2: Convert to fraction form
    1,420.58/2,130.54 = 446.45/x
  3. Step 3: Cross multiply
    1,420.58x = 2,130.54 × 446.45
  4. Step 4: Simplify right side
    1,420.58x = 951,168.93
  5. Step 5: Solve for x
    x = 951,168.93/1,420.58
  6. Step 6: Final answer
    x = 669.57

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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.