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Finding the Fourth Proportional to 711,015.16, 981,189.78 and 388,717.72

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Solution

The fourth proportional to 711,015.16, 981,189.78 and 388,717.72 is: 536,424.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,015.16 : 981,189.78 = 388,717.72 : x
  2. Step 2: Convert to fraction form
    711,015.16/981,189.78 = 388,717.72/x
  3. Step 3: Cross multiply
    711,015.16x = 981,189.78 × 388,717.72
  4. Step 4: Simplify right side
    711,015.16x = 381,405,854,168.90
  5. Step 5: Solve for x
    x = 381,405,854,168.90/711,015.16
  6. Step 6: Final answer
    x = 536,424.36

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1.5x scale

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.