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Finding the Fourth Proportional to 280,855.20, 421,407.60 and 147,703.20

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Solution

The fourth proportional to 280,855.20, 421,407.60 and 147,703.20 is: 221,620.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,855.20 : 421,407.60 = 147,703.20 : x
  2. Step 2: Convert to fraction form
    280,855.20/421,407.60 = 147,703.20/x
  3. Step 3: Cross multiply
    280,855.20x = 421,407.60 × 147,703.20
  4. Step 4: Simplify right side
    280,855.20x = 62,243,251,024.32
  5. Step 5: Solve for x
    x = 62,243,251,024.32/280,855.20
  6. Step 6: Final answer
    x = 221,620.43

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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.