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Finding the Fourth Proportional to 515,640.22, 711,669.12 and 300,780.44

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Solution

The fourth proportional to 515,640.22, 711,669.12 and 300,780.44 is: 415,126.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,640.22 : 711,669.12 = 300,780.44 : x
  2. Step 2: Convert to fraction form
    515,640.22/711,669.12 = 300,780.44/x
  3. Step 3: Cross multiply
    515,640.22x = 711,669.12 × 300,780.44
  4. Step 4: Simplify right side
    515,640.22x = 214,056,151,048.01
  5. Step 5: Solve for x
    x = 214,056,151,048.01/515,640.22
  6. Step 6: Final answer
    x = 415,126.95

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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.