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Finding the Fourth Proportional to 280,671.16, 421,111.52 and 168,431.88

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Solution

The fourth proportional to 280,671.16, 421,111.52 and 168,431.88 is: 252,710.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,671.16 : 421,111.52 = 168,431.88 : x
  2. Step 2: Convert to fraction form
    280,671.16/421,111.52 = 168,431.88/x
  3. Step 3: Cross multiply
    280,671.16x = 421,111.52 × 168,431.88
  4. Step 4: Simplify right side
    280,671.16x = 70,928,605,003.26
  5. Step 5: Solve for x
    x = 70,928,605,003.26/280,671.16
  6. Step 6: Final answer
    x = 252,710.70

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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.