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Finding the Fourth Proportional to 709,079.55, 978,528.15 and 386,789.62

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Solution

The fourth proportional to 709,079.55, 978,528.15 and 386,789.62 is: 533,768.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,079.55 : 978,528.15 = 386,789.62 : x
  2. Step 2: Convert to fraction form
    709,079.55/978,528.15 = 386,789.62/x
  3. Step 3: Cross multiply
    709,079.55x = 978,528.15 × 386,789.62
  4. Step 4: Simplify right side
    709,079.55x = 378,484,531,297.80
  5. Step 5: Solve for x
    x = 378,484,531,297.80/709,079.55
  6. Step 6: Final answer
    x = 533,768.79

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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.