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Finding the Fourth Proportional to 1,621.57, 2,430.33 and 889.87

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Solution

The fourth proportional to 1,621.57, 2,430.33 and 889.87 is: 1,333.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.57 : 2,430.33 = 889.87 : x
  2. Step 2: Convert to fraction form
    1,621.57/2,430.33 = 889.87/x
  3. Step 3: Cross multiply
    1,621.57x = 2,430.33 × 889.87
  4. Step 4: Simplify right side
    1,621.57x = 2,162,677.76
  5. Step 5: Solve for x
    x = 2,162,677.76/1,621.57
  6. Step 6: Final answer
    x = 1,333.69

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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.