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Finding the Fourth Proportional to 978,178.45, 1,370,382.95 and 978,178.45

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Solution

The fourth proportional to 978,178.45, 1,370,382.95 and 978,178.45 is: 1,370,382.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,178.45 : 1,370,382.95 = 978,178.45 : x
  2. Step 2: Convert to fraction form
    978,178.45/1,370,382.95 = 978,178.45/x
  3. Step 3: Cross multiply
    978,178.45x = 1,370,382.95 × 978,178.45
  4. Step 4: Simplify right side
    978,178.45x = 1,340,479,069,937.43
  5. Step 5: Solve for x
    x = 1,340,479,069,937.43/978,178.45
  6. Step 6: Final answer
    x = 1,370,382.95

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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.