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Finding the Fourth Proportional to 1,670.90, 2,505.81 and 1,021.55

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Solution

The fourth proportional to 1,670.90, 2,505.81 and 1,021.55 is: 1,531.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,670.90 : 2,505.81 = 1,021.55 : x
  2. Step 2: Convert to fraction form
    1,670.90/2,505.81 = 1,021.55/x
  3. Step 3: Cross multiply
    1,670.90x = 2,505.81 × 1,021.55
  4. Step 4: Simplify right side
    1,670.90x = 2,559,810.21
  5. Step 5: Solve for x
    x = 2,559,810.21/1,670.90
  6. Step 6: Final answer
    x = 1,531.99

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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.