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Finding the Fourth Proportional to 139,968,019.30, 209,952,028.95 and 103,688,313.70

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Solution

The fourth proportional to 139,968,019.30, 209,952,028.95 and 103,688,313.70 is: 155,532,470.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,019.30 : 209,952,028.95 = 103,688,313.70 : x
  2. Step 2: Convert to fraction form
    139,968,019.30/209,952,028.95 = 103,688,313.70/x
  3. Step 3: Cross multiply
    139,968,019.30x = 209,952,028.95 × 103,688,313.70
  4. Step 4: Simplify right side
    139,968,019.30x = 21,769,571,839,719,080
  5. Step 5: Solve for x
    x = 21,769,571,839,719,080/139,968,019.30
  6. Step 6: Final answer
    x = 155,532,470.55

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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.