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Finding the Fourth Proportional to 278,443.85, 417,598.80 and 128,540.21

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Solution

The fourth proportional to 278,443.85, 417,598.80 and 128,540.21 is: 192,779.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,443.85 : 417,598.80 = 128,540.21 : x
  2. Step 2: Convert to fraction form
    278,443.85/417,598.80 = 128,540.21/x
  3. Step 3: Cross multiply
    278,443.85x = 417,598.80 × 128,540.21
  4. Step 4: Simplify right side
    278,443.85x = 53,678,235,359.75
  5. Step 5: Solve for x
    x = 53,678,235,359.75/278,443.85
  6. Step 6: Final answer
    x = 192,779.39

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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.