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Finding the Fourth Proportional to 716,912.12, 989,331.20 and 394,615.32

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Solution

The fourth proportional to 716,912.12, 989,331.20 and 394,615.32 is: 544,565.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,912.12 : 989,331.20 = 394,615.32 : x
  2. Step 2: Convert to fraction form
    716,912.12/989,331.20 = 394,615.32/x
  3. Step 3: Cross multiply
    716,912.12x = 989,331.20 × 394,615.32
  4. Step 4: Simplify right side
    716,912.12x = 390,405,248,073.98
  5. Step 5: Solve for x
    x = 390,405,248,073.98/716,912.12
  6. Step 6: Final answer
    x = 544,565.00

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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.