Home / 645,205.09-890,432.90-387,091.75

Finding the Fourth Proportional to 645,205.09, 890,432.90 and 387,091.75

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Solution

The fourth proportional to 645,205.09, 890,432.90 and 387,091.75 is: 534,216.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,205.09 : 890,432.90 = 387,091.75 : x
  2. Step 2: Convert to fraction form
    645,205.09/890,432.90 = 387,091.75/x
  3. Step 3: Cross multiply
    645,205.09x = 890,432.90 × 387,091.75
  4. Step 4: Simplify right side
    645,205.09x = 344,679,227,583.12
  5. Step 5: Solve for x
    x = 344,679,227,583.12/645,205.09
  6. Step 6: Final answer
    x = 534,216.54

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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.