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Finding the Fourth Proportional to 425,878,303.80, 638,817,455.70 and 280,476,046.20

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Solution

The fourth proportional to 425,878,303.80, 638,817,455.70 and 280,476,046.20 is: 420,714,069.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,878,303.80 : 638,817,455.70 = 280,476,046.20 : x
  2. Step 2: Convert to fraction form
    425,878,303.80/638,817,455.70 = 280,476,046.20/x
  3. Step 3: Cross multiply
    425,878,303.80x = 638,817,455.70 × 280,476,046.20
  4. Step 4: Simplify right side
    425,878,303.80x = 179,172,994,218,279,648
  5. Step 5: Solve for x
    x = 179,172,994,218,279,648/425,878,303.80
  6. Step 6: Final answer
    x = 420,714,069.30

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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.