Home / 390,665,065.32-539,103,841.20-221,115,662.80

Finding the Fourth Proportional to 390,665,065.32, 539,103,841.20 and 221,115,662.80

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Solution

The fourth proportional to 390,665,065.32, 539,103,841.20 and 221,115,662.80 is: 305,131,719.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,665,065.32 : 539,103,841.20 = 221,115,662.80 : x
  2. Step 2: Convert to fraction form
    390,665,065.32/539,103,841.20 = 221,115,662.80/x
  3. Step 3: Cross multiply
    390,665,065.32x = 539,103,841.20 × 221,115,662.80
  4. Step 4: Simplify right side
    390,665,065.32x = 119,204,303,163,616,208
  5. Step 5: Solve for x
    x = 119,204,303,163,616,208/390,665,065.32
  6. Step 6: Final answer
    x = 305,131,719.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.