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Finding the Fourth Proportional to 128,985.80, 193,478.70 and 121,728.20

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Solution

The fourth proportional to 128,985.80, 193,478.70 and 121,728.20 is: 182,592.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985.80 : 193,478.70 = 121,728.20 : x
  2. Step 2: Convert to fraction form
    128,985.80/193,478.70 = 121,728.20/x
  3. Step 3: Cross multiply
    128,985.80x = 193,478.70 × 121,728.20
  4. Step 4: Simplify right side
    128,985.80x = 23,551,813,889.34
  5. Step 5: Solve for x
    x = 23,551,813,889.34/128,985.80
  6. Step 6: Final answer
    x = 182,592.30

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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.