Home / 81,656,999.10-122,485,498.65-81,090,128.70

Finding the Fourth Proportional to 81,656,999.10, 122,485,498.65 and 81,090,128.70

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Solution

The fourth proportional to 81,656,999.10, 122,485,498.65 and 81,090,128.70 is: 121,635,193.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,656,999.10 : 122,485,498.65 = 81,090,128.70 : x
  2. Step 2: Convert to fraction form
    81,656,999.10/122,485,498.65 = 81,090,128.70/x
  3. Step 3: Cross multiply
    81,656,999.10x = 122,485,498.65 × 81,090,128.70
  4. Step 4: Simplify right side
    81,656,999.10x = 9,932,364,849,412,178
  5. Step 5: Solve for x
    x = 9,932,364,849,412,178/81,656,999.10
  6. Step 6: Final answer
    x = 121,635,193.05

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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.