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Finding the Fourth Proportional to 2,290.88, 3,436.29 and 647.21

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Solution

The fourth proportional to 2,290.88, 3,436.29 and 647.21 is: 970.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,290.88 : 3,436.29 = 647.21 : x
  2. Step 2: Convert to fraction form
    2,290.88/3,436.29 = 647.21/x
  3. Step 3: Cross multiply
    2,290.88x = 3,436.29 × 647.21
  4. Step 4: Simplify right side
    2,290.88x = 2,223,984.07
  5. Step 5: Solve for x
    x = 2,223,984.07/2,290.88
  6. Step 6: Final answer
    x = 970.80

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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.