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Finding the Fourth Proportional to 679,994.46, 938,424.08 and 393,459.12

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Solution

The fourth proportional to 679,994.46, 938,424.08 and 393,459.12 is: 542,991.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,994.46 : 938,424.08 = 393,459.12 : x
  2. Step 2: Convert to fraction form
    679,994.46/938,424.08 = 393,459.12/x
  3. Step 3: Cross multiply
    679,994.46x = 938,424.08 × 393,459.12
  4. Step 4: Simplify right side
    679,994.46x = 369,231,513,687.26
  5. Step 5: Solve for x
    x = 369,231,513,687.26/679,994.46
  6. Step 6: Final answer
    x = 542,991.94

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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.