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Finding the Fourth Proportional to 1,421.10, 2,132.91 and 728.24

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Solution

The fourth proportional to 1,421.10, 2,132.91 and 728.24 is: 1,093.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.10 : 2,132.91 = 728.24 : x
  2. Step 2: Convert to fraction form
    1,421.10/2,132.91 = 728.24/x
  3. Step 3: Cross multiply
    1,421.10x = 2,132.91 × 728.24
  4. Step 4: Simplify right side
    1,421.10x = 1,553,259.71
  5. Step 5: Solve for x
    x = 1,553,259.71/1,421.10
  6. Step 6: Final answer
    x = 1,093.00

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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.