Home / 85,823,999.20-128,735,998.80-21,127,290.40

Finding the Fourth Proportional to 85,823,999.20, 128,735,998.80 and 21,127,290.40

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Solution

The fourth proportional to 85,823,999.20, 128,735,998.80 and 21,127,290.40 is: 31,690,935.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,823,999.20 : 128,735,998.80 = 21,127,290.40 : x
  2. Step 2: Convert to fraction form
    85,823,999.20/128,735,998.80 = 21,127,290.40/x
  3. Step 3: Cross multiply
    85,823,999.20x = 128,735,998.80 × 21,127,290.40
  4. Step 4: Simplify right side
    85,823,999.20x = 2,719,842,831,581,651.50
  5. Step 5: Solve for x
    x = 2,719,842,831,581,651.50/85,823,999.20
  6. Step 6: Final answer
    x = 31,690,935.60

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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.