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Finding the Fourth Proportional to 642,718.72, 886,949.52 and 356,236

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Solution

The fourth proportional to 642,718.72, 886,949.52 and 356,236 is: 491,604.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,718.72 : 886,949.52 = 356,236 : x
  2. Step 2: Convert to fraction form
    642,718.72/886,949.52 = 356,236/x
  3. Step 3: Cross multiply
    642,718.72x = 886,949.52 × 356,236
  4. Step 4: Simplify right side
    642,718.72x = 315,963,349,206.72
  5. Step 5: Solve for x
    x = 315,963,349,206.72/642,718.72
  6. Step 6: Final answer
    x = 491,604.40

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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.