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Finding the Fourth Proportional to 711,478.25, 981,863.60 and 389,188.72

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Solution

The fourth proportional to 711,478.25, 981,863.60 and 389,188.72 is: 537,093.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,478.25 : 981,863.60 = 389,188.72 : x
  2. Step 2: Convert to fraction form
    711,478.25/981,863.60 = 389,188.72/x
  3. Step 3: Cross multiply
    711,478.25x = 981,863.60 × 389,188.72
  4. Step 4: Simplify right side
    711,478.25x = 382,130,237,698.59
  5. Step 5: Solve for x
    x = 382,130,237,698.59/711,478.25
  6. Step 6: Final answer
    x = 537,093.35

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Double scale
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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.