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Finding the Fourth Proportional to 642,643.16, 886,847.61 and 356,181.70

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Solution

The fourth proportional to 642,643.16, 886,847.61 and 356,181.70 is: 491,530.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,643.16 : 886,847.61 = 356,181.70 : x
  2. Step 2: Convert to fraction form
    642,643.16/886,847.61 = 356,181.70/x
  3. Step 3: Cross multiply
    642,643.16x = 886,847.61 × 356,181.70
  4. Step 4: Simplify right side
    642,643.16x = 315,878,889,370.74
  5. Step 5: Solve for x
    x = 315,878,889,370.74/642,643.16
  6. Step 6: Final answer
    x = 491,530.77

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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.