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Finding the Fourth Proportional to 279,803.12, 386,128.80 and 152,478.72

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Solution

The fourth proportional to 279,803.12, 386,128.80 and 152,478.72 is: 210,420.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,803.12 : 386,128.80 = 152,478.72 : x
  2. Step 2: Convert to fraction form
    279,803.12/386,128.80 = 152,478.72/x
  3. Step 3: Cross multiply
    279,803.12x = 386,128.80 × 152,478.72
  4. Step 4: Simplify right side
    279,803.12x = 58,876,425,179.14
  5. Step 5: Solve for x
    x = 58,876,425,179.14/279,803.12
  6. Step 6: Final answer
    x = 210,420.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.