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Finding the Fourth Proportional to 78,285,812.40, 117,428,718.60 and 78,285,812.40

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Solution

The fourth proportional to 78,285,812.40, 117,428,718.60 and 78,285,812.40 is: 117,428,718.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,285,812.40 : 117,428,718.60 = 78,285,812.40 : x
  2. Step 2: Convert to fraction form
    78,285,812.40/117,428,718.60 = 78,285,812.40/x
  3. Step 3: Cross multiply
    78,285,812.40x = 117,428,718.60 × 78,285,812.40
  4. Step 4: Simplify right side
    78,285,812.40x = 9,193,002,634,691,990
  5. Step 5: Solve for x
    x = 9,193,002,634,691,990/78,285,812.40
  6. Step 6: Final answer
    x = 117,428,718.60

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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.