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Finding the Fourth Proportional to 572,085.90, 858,128.85 and 439,634.70

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Solution

The fourth proportional to 572,085.90, 858,128.85 and 439,634.70 is: 659,452.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,085.90 : 858,128.85 = 439,634.70 : x
  2. Step 2: Convert to fraction form
    572,085.90/858,128.85 = 439,634.70/x
  3. Step 3: Cross multiply
    572,085.90x = 858,128.85 × 439,634.70
  4. Step 4: Simplify right side
    572,085.90x = 377,263,219,531.10
  5. Step 5: Solve for x
    x = 377,263,219,531.10/572,085.90
  6. Step 6: Final answer
    x = 659,452.05

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Double scale
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Similar ratio
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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.