Home / 121,142,147.20-181,713,220.80-72,769,206.40

Finding the Fourth Proportional to 121,142,147.20, 181,713,220.80 and 72,769,206.40

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Solution

The fourth proportional to 121,142,147.20, 181,713,220.80 and 72,769,206.40 is: 109,153,809.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,142,147.20 : 181,713,220.80 = 72,769,206.40 : x
  2. Step 2: Convert to fraction form
    121,142,147.20/181,713,220.80 = 72,769,206.40/x
  3. Step 3: Cross multiply
    121,142,147.20x = 181,713,220.80 × 72,769,206.40
  4. Step 4: Simplify right side
    121,142,147.20x = 13,223,126,870,003,976
  5. Step 5: Solve for x
    x = 13,223,126,870,003,976/121,142,147.20
  6. Step 6: Final answer
    x = 109,153,809.60

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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.