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Finding the Fourth Proportional to 572,091.40, 858,137.10 and 439,640.20

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Solution

The fourth proportional to 572,091.40, 858,137.10 and 439,640.20 is: 659,460.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,091.40 : 858,137.10 = 439,640.20 : x
  2. Step 2: Convert to fraction form
    572,091.40/858,137.10 = 439,640.20/x
  3. Step 3: Cross multiply
    572,091.40x = 858,137.10 × 439,640.20
  4. Step 4: Simplify right side
    572,091.40x = 377,271,566,271.42
  5. Step 5: Solve for x
    x = 377,271,566,271.42/572,091.40
  6. Step 6: Final answer
    x = 659,460.30

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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.