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Finding the Fourth Proportional to 978,761.30, 1,371,665.50 and 978,761.30

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Solution

The fourth proportional to 978,761.30, 1,371,665.50 and 978,761.30 is: 1,371,665.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,761.30 : 1,371,665.50 = 978,761.30 : x
  2. Step 2: Convert to fraction form
    978,761.30/1,371,665.50 = 978,761.30/x
  3. Step 3: Cross multiply
    978,761.30x = 1,371,665.50 × 978,761.30
  4. Step 4: Simplify right side
    978,761.30x = 1,342,533,107,945.15
  5. Step 5: Solve for x
    x = 1,342,533,107,945.15/978,761.30
  6. Step 6: Final answer
    x = 1,371,665.50

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.