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Finding the Fourth Proportional to 1,060.72, 1,590.90 and 411.40

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Solution

The fourth proportional to 1,060.72, 1,590.90 and 411.40 is: 617.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,060.72 : 1,590.90 = 411.40 : x
  2. Step 2: Convert to fraction form
    1,060.72/1,590.90 = 411.40/x
  3. Step 3: Cross multiply
    1,060.72x = 1,590.90 × 411.40
  4. Step 4: Simplify right side
    1,060.72x = 654,496.26
  5. Step 5: Solve for x
    x = 654,496.26/1,060.72
  6. Step 6: Final answer
    x = 617.03

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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.