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Finding the Fourth Proportional to 521,728.60, 783,111.30 and 255,789.40

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Solution

The fourth proportional to 521,728.60, 783,111.30 and 255,789.40 is: 383,938.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,728.60 : 783,111.30 = 255,789.40 : x
  2. Step 2: Convert to fraction form
    521,728.60/783,111.30 = 255,789.40/x
  3. Step 3: Cross multiply
    521,728.60x = 783,111.30 × 255,789.40
  4. Step 4: Simplify right side
    521,728.60x = 200,311,569,560.22
  5. Step 5: Solve for x
    x = 200,311,569,560.22/521,728.60
  6. Step 6: Final answer
    x = 383,938.26

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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.