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Finding the Fourth Proportional to 1,420.22, 2,127.99 and 865.07

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Solution

The fourth proportional to 1,420.22, 2,127.99 and 865.07 is: 1,296.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.22 : 2,127.99 = 865.07 : x
  2. Step 2: Convert to fraction form
    1,420.22/2,127.99 = 865.07/x
  3. Step 3: Cross multiply
    1,420.22x = 2,127.99 × 865.07
  4. Step 4: Simplify right side
    1,420.22x = 1,840,868.00
  5. Step 5: Solve for x
    x = 1,840,868.00/1,420.22
  6. Step 6: Final answer
    x = 1,296.18

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1.5x scale

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.