Home / 645,015.31-890,131.76-354,639.13

Finding the Fourth Proportional to 645,015.31, 890,131.76 and 354,639.13

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Solution

The fourth proportional to 645,015.31, 890,131.76 and 354,639.13 is: 489,407.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,015.31 : 890,131.76 = 354,639.13 : x
  2. Step 2: Convert to fraction form
    645,015.31/890,131.76 = 354,639.13/x
  3. Step 3: Cross multiply
    645,015.31x = 890,131.76 × 354,639.13
  4. Step 4: Simplify right side
    645,015.31x = 315,675,552,951.77
  5. Step 5: Solve for x
    x = 315,675,552,951.77/645,015.31
  6. Step 6: Final answer
    x = 489,407.85

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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.