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Finding the Fourth Proportional to 1,061.09, 1,590.48 and 445.13

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Solution

The fourth proportional to 1,061.09, 1,590.48 and 445.13 is: 667.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,061.09 : 1,590.48 = 445.13 : x
  2. Step 2: Convert to fraction form
    1,061.09/1,590.48 = 445.13/x
  3. Step 3: Cross multiply
    1,061.09x = 1,590.48 × 445.13
  4. Step 4: Simplify right side
    1,061.09x = 707,962.41
  5. Step 5: Solve for x
    x = 707,962.41/1,061.09
  6. Step 6: Final answer
    x = 667.21

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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.