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Finding the Fourth Proportional to 1,420.89, 2,130.02 and 763.23

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Solution

The fourth proportional to 1,420.89, 2,130.02 and 763.23 is: 1,144.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.89 : 2,130.02 = 763.23 : x
  2. Step 2: Convert to fraction form
    1,420.89/2,130.02 = 763.23/x
  3. Step 3: Cross multiply
    1,420.89x = 2,130.02 × 763.23
  4. Step 4: Simplify right side
    1,420.89x = 1,625,684.51
  5. Step 5: Solve for x
    x = 1,625,684.51/1,420.89
  6. Step 6: Final answer
    x = 1,144.13

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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.