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Finding the Fourth Proportional to 978,178.45, 1,371,938.15 and 978,178.45

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Solution

The fourth proportional to 978,178.45, 1,371,938.15 and 978,178.45 is: 1,371,938.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,178.45 : 1,371,938.15 = 978,178.45 : x
  2. Step 2: Convert to fraction form
    978,178.45/1,371,938.15 = 978,178.45/x
  3. Step 3: Cross multiply
    978,178.45x = 1,371,938.15 × 978,178.45
  4. Step 4: Simplify right side
    978,178.45x = 1,342,000,333,062.87
  5. Step 5: Solve for x
    x = 1,342,000,333,062.87/978,178.45
  6. Step 6: Final answer
    x = 1,371,938.15

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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.