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Finding the Fourth Proportional to 310,220.69, 428,135.90 and 189,432.68

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Solution

The fourth proportional to 310,220.69, 428,135.90 and 189,432.68 is: 261,436.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,220.69 : 428,135.90 = 189,432.68 : x
  2. Step 2: Convert to fraction form
    310,220.69/428,135.90 = 189,432.68/x
  3. Step 3: Cross multiply
    310,220.69x = 428,135.90 × 189,432.68
  4. Step 4: Simplify right side
    310,220.69x = 81,102,927,853.37
  5. Step 5: Solve for x
    x = 81,102,927,853.37/310,220.69
  6. Step 6: Final answer
    x = 261,436.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.