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Finding the Fourth Proportional to 2,290.20, 3,435.48 and 646.72

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Solution

The fourth proportional to 2,290.20, 3,435.48 and 646.72 is: 970.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,290.20 : 3,435.48 = 646.72 : x
  2. Step 2: Convert to fraction form
    2,290.20/3,435.48 = 646.72/x
  3. Step 3: Cross multiply
    2,290.20x = 3,435.48 × 646.72
  4. Step 4: Simplify right side
    2,290.20x = 2,221,793.63
  5. Step 5: Solve for x
    x = 2,221,793.63/2,290.20
  6. Step 6: Final answer
    x = 970.13

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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.