Home / 85,407,814.97-128,111,681.45-20,711,609.18

Finding the Fourth Proportional to 85,407,814.97, 128,111,681.45 and 20,711,609.18

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Solution

The fourth proportional to 85,407,814.97, 128,111,681.45 and 20,711,609.18 is: 31,067,403.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,407,814.97 : 128,111,681.45 = 20,711,609.18 : x
  2. Step 2: Convert to fraction form
    85,407,814.97/128,111,681.45 = 20,711,609.18/x
  3. Step 3: Cross multiply
    85,407,814.97x = 128,111,681.45 × 20,711,609.18
  4. Step 4: Simplify right side
    85,407,814.97x = 2,653,399,077,585,055.50
  5. Step 5: Solve for x
    x = 2,653,399,077,585,055.50/85,407,814.97
  6. Step 6: Final answer
    x = 31,067,403.83

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Double scale
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1.5x scale

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.