Home / 645,203.12-890,430.18-387,089.78

Finding the Fourth Proportional to 645,203.12, 890,430.18 and 387,089.78

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Solution

The fourth proportional to 645,203.12, 890,430.18 and 387,089.78 is: 534,213.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,203.12 : 890,430.18 = 387,089.78 : x
  2. Step 2: Convert to fraction form
    645,203.12/890,430.18 = 387,089.78/x
  3. Step 3: Cross multiply
    645,203.12x = 890,430.18 × 387,089.78
  4. Step 4: Simplify right side
    645,203.12x = 344,676,422,481.56
  5. Step 5: Solve for x
    x = 344,676,422,481.56/645,203.12
  6. Step 6: Final answer
    x = 534,213.82

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Double scale
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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.