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Finding the Fourth Proportional to 717,146.16, 989,642.10 and 394,857.99

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Solution

The fourth proportional to 717,146.16, 989,642.10 and 394,857.99 is: 544,893.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,146.16 : 989,642.10 = 394,857.99 : x
  2. Step 2: Convert to fraction form
    717,146.16/989,642.10 = 394,857.99/x
  3. Step 3: Cross multiply
    717,146.16x = 989,642.10 × 394,857.99
  4. Step 4: Simplify right side
    717,146.16x = 390,768,091,906.10
  5. Step 5: Solve for x
    x = 390,768,091,906.10/717,146.16
  6. Step 6: Final answer
    x = 544,893.24

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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.