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Finding the Fourth Proportional to 202,720.40, 304,080.60 and 128,070.80

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Solution

The fourth proportional to 202,720.40, 304,080.60 and 128,070.80 is: 192,106.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    202,720.40 : 304,080.60 = 128,070.80 : x
  2. Step 2: Convert to fraction form
    202,720.40/304,080.60 = 128,070.80/x
  3. Step 3: Cross multiply
    202,720.40x = 304,080.60 × 128,070.80
  4. Step 4: Simplify right side
    202,720.40x = 38,943,845,706.48
  5. Step 5: Solve for x
    x = 38,943,845,706.48/202,720.40
  6. Step 6: Final answer
    x = 192,106.20

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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.