Home / 1,290.89-1,938.45-1,225.16

Finding the Fourth Proportional to 1,290.89, 1,938.45 and 1,225.16

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Solution

The fourth proportional to 1,290.89, 1,938.45 and 1,225.16 is: 1,839.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.89 : 1,938.45 = 1,225.16 : x
  2. Step 2: Convert to fraction form
    1,290.89/1,938.45 = 1,225.16/x
  3. Step 3: Cross multiply
    1,290.89x = 1,938.45 × 1,225.16
  4. Step 4: Simplify right side
    1,290.89x = 2,374,901.71
  5. Step 5: Solve for x
    x = 2,374,901.71/1,290.89
  6. Step 6: Final answer
    x = 1,839.75

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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.