Home / 85,824,140.80-128,736,211.20-81,842,828.80

Finding the Fourth Proportional to 85,824,140.80, 128,736,211.20 and 81,842,828.80

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Solution

The fourth proportional to 85,824,140.80, 128,736,211.20 and 81,842,828.80 is: 122,764,243.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,824,140.80 : 128,736,211.20 = 81,842,828.80 : x
  2. Step 2: Convert to fraction form
    85,824,140.80/128,736,211.20 = 81,842,828.80/x
  3. Step 3: Cross multiply
    85,824,140.80x = 128,736,211.20 × 81,842,828.80
  4. Step 4: Simplify right side
    85,824,140.80x = 10,536,135,693,602,242
  5. Step 5: Solve for x
    x = 10,536,135,693,602,242/85,824,140.80
  6. Step 6: Final answer
    x = 122,764,243.20

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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.