Home / 85,929,719.78-128,891,084.12-21,231,895.62

Finding the Fourth Proportional to 85,929,719.78, 128,891,084.12 and 21,231,895.62

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Solution

The fourth proportional to 85,929,719.78, 128,891,084.12 and 21,231,895.62 is: 31,846,979.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,929,719.78 : 128,891,084.12 = 21,231,895.62 : x
  2. Step 2: Convert to fraction form
    85,929,719.78/128,891,084.12 = 21,231,895.62/x
  3. Step 3: Cross multiply
    85,929,719.78x = 128,891,084.12 × 21,231,895.62
  4. Step 4: Simplify right side
    85,929,719.78x = 2,736,602,044,384,480
  5. Step 5: Solve for x
    x = 2,736,602,044,384,480/85,929,719.78
  6. Step 6: Final answer
    x = 31,846,979.73

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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.