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Finding the Fourth Proportional to 978,166.20, 1,371,921 and 978,166.20

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Solution

The fourth proportional to 978,166.20, 1,371,921 and 978,166.20 is: 1,371,921

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,166.20 : 1,371,921 = 978,166.20 : x
  2. Step 2: Convert to fraction form
    978,166.20/1,371,921 = 978,166.20/x
  3. Step 3: Cross multiply
    978,166.20x = 1,371,921 × 978,166.20
  4. Step 4: Simplify right side
    978,166.20x = 1,341,966,751,270.20
  5. Step 5: Solve for x
    x = 1,341,966,751,270.20/978,166.20
  6. Step 6: Final answer
    x = 1,371,921

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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.