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Finding the Fourth Proportional to 1,490.25, 2,235.42 and 553.43

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Solution

The fourth proportional to 1,490.25, 2,235.42 and 553.43 is: 830.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.25 : 2,235.42 = 553.43 : x
  2. Step 2: Convert to fraction form
    1,490.25/2,235.42 = 553.43/x
  3. Step 3: Cross multiply
    1,490.25x = 2,235.42 × 553.43
  4. Step 4: Simplify right side
    1,490.25x = 1,237,148.49
  5. Step 5: Solve for x
    x = 1,237,148.49/1,490.25
  6. Step 6: Final answer
    x = 830.16

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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.