Home / 645,140.72-890,350.85-354,803.39

Finding the Fourth Proportional to 645,140.72, 890,350.85 and 354,803.39

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Solution

The fourth proportional to 645,140.72, 890,350.85 and 354,803.39 is: 489,659.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,140.72 : 890,350.85 = 354,803.39 : x
  2. Step 2: Convert to fraction form
    645,140.72/890,350.85 = 354,803.39/x
  3. Step 3: Cross multiply
    645,140.72x = 890,350.85 × 354,803.39
  4. Step 4: Simplify right side
    645,140.72x = 315,899,493,643.61
  5. Step 5: Solve for x
    x = 315,899,493,643.61/645,140.72
  6. Step 6: Final answer
    x = 489,659.83

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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.