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Finding the Fourth Proportional to 121,210.80, 181,816.20 and 79,220.40

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Solution

The fourth proportional to 121,210.80, 181,816.20 and 79,220.40 is: 118,830.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,210.80 : 181,816.20 = 79,220.40 : x
  2. Step 2: Convert to fraction form
    121,210.80/181,816.20 = 79,220.40/x
  3. Step 3: Cross multiply
    121,210.80x = 181,816.20 × 79,220.40
  4. Step 4: Simplify right side
    121,210.80x = 14,403,552,090.48
  5. Step 5: Solve for x
    x = 14,403,552,090.48/121,210.80
  6. Step 6: Final answer
    x = 118,830.60

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1.5x scale

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.