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Finding the Fourth Proportional to 579,640.60, 869,720.10 and 205,931.80

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Solution

The fourth proportional to 579,640.60, 869,720.10 and 205,931.80 is: 308,989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,640.60 : 869,720.10 = 205,931.80 : x
  2. Step 2: Convert to fraction form
    579,640.60/869,720.10 = 205,931.80/x
  3. Step 3: Cross multiply
    579,640.60x = 869,720.10 × 205,931.80
  4. Step 4: Simplify right side
    579,640.60x = 179,103,025,689.18
  5. Step 5: Solve for x
    x = 179,103,025,689.18/579,640.60
  6. Step 6: Final answer
    x = 308,989.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.