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Finding the Fourth Proportional to 2,287.09, 3,430.59 and 643.60

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Solution

The fourth proportional to 2,287.09, 3,430.59 and 643.60 is: 965.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,287.09 : 3,430.59 = 643.60 : x
  2. Step 2: Convert to fraction form
    2,287.09/3,430.59 = 643.60/x
  3. Step 3: Cross multiply
    2,287.09x = 3,430.59 × 643.60
  4. Step 4: Simplify right side
    2,287.09x = 2,207,927.72
  5. Step 5: Solve for x
    x = 2,207,927.72/2,287.09
  6. Step 6: Final answer
    x = 965.39

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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.