Home / 642,621.72-886,802.79-356,135.64

Finding the Fourth Proportional to 642,621.72, 886,802.79 and 356,135.64

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Solution

The fourth proportional to 642,621.72, 886,802.79 and 356,135.64 is: 491,458.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,621.72 : 886,802.79 = 356,135.64 : x
  2. Step 2: Convert to fraction form
    642,621.72/886,802.79 = 356,135.64/x
  3. Step 3: Cross multiply
    642,621.72x = 886,802.79 × 356,135.64
  4. Step 4: Simplify right side
    642,621.72x = 315,822,079,170.44
  5. Step 5: Solve for x
    x = 315,822,079,170.44/642,621.72
  6. Step 6: Final answer
    x = 491,458.77

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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.