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Finding the Fourth Proportional to 81,018,368.64, 111,795,448.32 and 64,540,454.40

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Solution

The fourth proportional to 81,018,368.64, 111,795,448.32 and 64,540,454.40 is: 89,057,940.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,018,368.64 : 111,795,448.32 = 64,540,454.40 : x
  2. Step 2: Convert to fraction form
    81,018,368.64/111,795,448.32 = 64,540,454.40/x
  3. Step 3: Cross multiply
    81,018,368.64x = 111,795,448.32 × 64,540,454.40
  4. Step 4: Simplify right side
    81,018,368.64x = 7,215,329,034,424,516
  5. Step 5: Solve for x
    x = 7,215,329,034,424,516/81,018,368.64
  6. Step 6: Final answer
    x = 89,057,940.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.