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Finding the Fourth Proportional to 709,081.98, 978,539.39 and 386,793.51

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Solution

The fourth proportional to 709,081.98, 978,539.39 and 386,793.51 is: 533,778.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,081.98 : 978,539.39 = 386,793.51 : x
  2. Step 2: Convert to fraction form
    709,081.98/978,539.39 = 386,793.51/x
  3. Step 3: Cross multiply
    709,081.98x = 978,539.39 × 386,793.51
  4. Step 4: Simplify right side
    709,081.98x = 378,492,683,397.39
  5. Step 5: Solve for x
    x = 378,492,683,397.39/709,081.98
  6. Step 6: Final answer
    x = 533,778.45

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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.