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Finding the Fourth Proportional to 640,857.20, 961,285.80 and 167,590.40

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Solution

The fourth proportional to 640,857.20, 961,285.80 and 167,590.40 is: 251,385.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,857.20 : 961,285.80 = 167,590.40 : x
  2. Step 2: Convert to fraction form
    640,857.20/961,285.80 = 167,590.40/x
  3. Step 3: Cross multiply
    640,857.20x = 961,285.80 × 167,590.40
  4. Step 4: Simplify right side
    640,857.20x = 161,102,271,736.32
  5. Step 5: Solve for x
    x = 161,102,271,736.32/640,857.20
  6. Step 6: Final answer
    x = 251,385.60

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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.