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Finding the Fourth Proportional to 1,460.70, 2,191.17 and 420.81

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Solution

The fourth proportional to 1,460.70, 2,191.17 and 420.81 is: 631.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,460.70 : 2,191.17 = 420.81 : x
  2. Step 2: Convert to fraction form
    1,460.70/2,191.17 = 420.81/x
  3. Step 3: Cross multiply
    1,460.70x = 2,191.17 × 420.81
  4. Step 4: Simplify right side
    1,460.70x = 922,059.61
  5. Step 5: Solve for x
    x = 922,059.61/1,460.70
  6. Step 6: Final answer
    x = 631.25

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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.