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Finding the Fourth Proportional to 978,371.80, 1,467,557.70 and 645,947.80

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Solution

The fourth proportional to 978,371.80, 1,467,557.70 and 645,947.80 is: 968,921.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,371.80 : 1,467,557.70 = 645,947.80 : x
  2. Step 2: Convert to fraction form
    978,371.80/1,467,557.70 = 645,947.80/x
  3. Step 3: Cross multiply
    978,371.80x = 1,467,557.70 × 645,947.80
  4. Step 4: Simplify right side
    978,371.80x = 947,965,667,688.06
  5. Step 5: Solve for x
    x = 947,965,667,688.06/978,371.80
  6. Step 6: Final answer
    x = 968,921.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.