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Finding the Fourth Proportional to 1,460.87, 2,191.25 and 420.89

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Solution

The fourth proportional to 1,460.87, 2,191.25 and 420.89 is: 631.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,460.87 : 2,191.25 = 420.89 : x
  2. Step 2: Convert to fraction form
    1,460.87/2,191.25 = 420.89/x
  3. Step 3: Cross multiply
    1,460.87x = 2,191.25 × 420.89
  4. Step 4: Simplify right side
    1,460.87x = 922,265.31
  5. Step 5: Solve for x
    x = 922,265.31/1,460.87
  6. Step 6: Final answer
    x = 631.31

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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.