Home / 121,938,409.12-168,275,243.52-72,388,720

Finding the Fourth Proportional to 121,938,409.12, 168,275,243.52 and 72,388,720

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Solution

The fourth proportional to 121,938,409.12, 168,275,243.52 and 72,388,720 is: 99,896,575.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,938,409.12 : 168,275,243.52 = 72,388,720 : x
  2. Step 2: Convert to fraction form
    121,938,409.12/168,275,243.52 = 72,388,720/x
  3. Step 3: Cross multiply
    121,938,409.12x = 168,275,243.52 × 72,388,720
  4. Step 4: Simplify right side
    121,938,409.12x = 12,181,229,486,101,096
  5. Step 5: Solve for x
    x = 12,181,229,486,101,096/121,938,409.12
  6. Step 6: Final answer
    x = 99,896,575.44

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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.