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Finding the Fourth Proportional to 711,329.30, 981,620.64 and 389,038.40

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Solution

The fourth proportional to 711,329.30, 981,620.64 and 389,038.40 is: 536,865.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,329.30 : 981,620.64 = 389,038.40 : x
  2. Step 2: Convert to fraction form
    711,329.30/981,620.64 = 389,038.40/x
  3. Step 3: Cross multiply
    711,329.30x = 981,620.64 × 389,038.40
  4. Step 4: Simplify right side
    711,329.30x = 381,888,123,192.58
  5. Step 5: Solve for x
    x = 381,888,123,192.58/711,329.30
  6. Step 6: Final answer
    x = 536,865.45

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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.