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Finding the Fourth Proportional to 709,188.35, 978,557.49 and 399,047.72

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Solution

The fourth proportional to 709,188.35, 978,557.49 and 399,047.72 is: 550,616.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,188.35 : 978,557.49 = 399,047.72 : x
  2. Step 2: Convert to fraction form
    709,188.35/978,557.49 = 399,047.72/x
  3. Step 3: Cross multiply
    709,188.35x = 978,557.49 × 399,047.72
  4. Step 4: Simplify right side
    709,188.35x = 390,491,130,380.64
  5. Step 5: Solve for x
    x = 390,491,130,380.64/709,188.35
  6. Step 6: Final answer
    x = 550,616.96

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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.