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Finding the Fourth Proportional to 223,021.80, 334,532.70 and 128,543.40

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Solution

The fourth proportional to 223,021.80, 334,532.70 and 128,543.40 is: 192,815.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,021.80 : 334,532.70 = 128,543.40 : x
  2. Step 2: Convert to fraction form
    223,021.80/334,532.70 = 128,543.40/x
  3. Step 3: Cross multiply
    223,021.80x = 334,532.70 × 128,543.40
  4. Step 4: Simplify right side
    223,021.80x = 43,001,970,669.18
  5. Step 5: Solve for x
    x = 43,001,970,669.18/223,021.80
  6. Step 6: Final answer
    x = 192,815.10

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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.