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Finding the Fourth Proportional to 642,701.16, 886,912.20 and 356,215.08

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Solution

The fourth proportional to 642,701.16, 886,912.20 and 356,215.08 is: 491,568.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,701.16 : 886,912.20 = 356,215.08 : x
  2. Step 2: Convert to fraction form
    642,701.16/886,912.20 = 356,215.08/x
  3. Step 3: Cross multiply
    642,701.16x = 886,912.20 × 356,215.08
  4. Step 4: Simplify right side
    642,701.16x = 315,931,500,275.98
  5. Step 5: Solve for x
    x = 315,931,500,275.98/642,701.16
  6. Step 6: Final answer
    x = 491,568.27

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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.