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Finding the Fourth Proportional to 642,471.40, 886,616.58 and 355,994.92

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Solution

The fourth proportional to 642,471.40, 886,616.58 and 355,994.92 is: 491,276.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,471.40 : 886,616.58 = 355,994.92 : x
  2. Step 2: Convert to fraction form
    642,471.40/886,616.58 = 355,994.92/x
  3. Step 3: Cross multiply
    642,471.40x = 886,616.58 × 355,994.92
  4. Step 4: Simplify right side
    642,471.40x = 315,630,998,467.77
  5. Step 5: Solve for x
    x = 315,630,998,467.77/642,471.40
  6. Step 6: Final answer
    x = 491,276.34

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.