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Finding the Fourth Proportional to 646,085.80, 969,171.90 and 219,615.40

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Solution

The fourth proportional to 646,085.80, 969,171.90 and 219,615.40 is: 329,437.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,085.80 : 969,171.90 = 219,615.40 : x
  2. Step 2: Convert to fraction form
    646,085.80/969,171.90 = 219,615.40/x
  3. Step 3: Cross multiply
    646,085.80x = 969,171.90 × 219,615.40
  4. Step 4: Simplify right side
    646,085.80x = 212,845,074,487.26
  5. Step 5: Solve for x
    x = 212,845,074,487.26/646,085.80
  6. Step 6: Final answer
    x = 329,437.78

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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.