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Finding the Fourth Proportional to 709,003.68, 978,436.61 and 386,713.69

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Solution

The fourth proportional to 709,003.68, 978,436.61 and 386,713.69 is: 533,671.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,003.68 : 978,436.61 = 386,713.69 : x
  2. Step 2: Convert to fraction form
    709,003.68/978,436.61 = 386,713.69/x
  3. Step 3: Cross multiply
    709,003.68x = 978,436.61 × 386,713.69
  4. Step 4: Simplify right side
    709,003.68x = 378,374,836,633.68
  5. Step 5: Solve for x
    x = 378,374,836,633.68/709,003.68
  6. Step 6: Final answer
    x = 533,671.19

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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.