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Finding the Fourth Proportional to 638,699.20, 958,679.12 and 339,178.92

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Solution

The fourth proportional to 638,699.20, 958,679.12 and 339,178.92 is: 509,103.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,699.20 : 958,679.12 = 339,178.92 : x
  2. Step 2: Convert to fraction form
    638,699.20/958,679.12 = 339,178.92/x
  3. Step 3: Cross multiply
    638,699.20x = 958,679.12 × 339,178.92
  4. Step 4: Simplify right side
    638,699.20x = 325,163,748,548.15
  5. Step 5: Solve for x
    x = 325,163,748,548.15/638,699.20
  6. Step 6: Final answer
    x = 509,103.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.