Home / 645,257.31-890,676.59-390,608.57

Finding the Fourth Proportional to 645,257.31, 890,676.59 and 390,608.57

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Solution

The fourth proportional to 645,257.31, 890,676.59 and 390,608.57 is: 539,173.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,257.31 : 890,676.59 = 390,608.57 : x
  2. Step 2: Convert to fraction form
    645,257.31/890,676.59 = 390,608.57/x
  3. Step 3: Cross multiply
    645,257.31x = 890,676.59 × 390,608.57
  4. Step 4: Simplify right side
    645,257.31x = 347,905,902,745.95
  5. Step 5: Solve for x
    x = 347,905,902,745.95/645,257.31
  6. Step 6: Final answer
    x = 539,173.90

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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.