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Finding the Fourth Proportional to 286,273.20, 429,409.80 and 128,809.20

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Solution

The fourth proportional to 286,273.20, 429,409.80 and 128,809.20 is: 193,213.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,273.20 : 429,409.80 = 128,809.20 : x
  2. Step 2: Convert to fraction form
    286,273.20/429,409.80 = 128,809.20/x
  3. Step 3: Cross multiply
    286,273.20x = 429,409.80 × 128,809.20
  4. Step 4: Simplify right side
    286,273.20x = 55,311,932,810.16
  5. Step 5: Solve for x
    x = 55,311,932,810.16/286,273.20
  6. Step 6: Final answer
    x = 193,213.80

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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.