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Finding the Fourth Proportional to 978,221,572.80, 1,469,032,970.40 and 519,056,548.80

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Solution

The fourth proportional to 978,221,572.80, 1,469,032,970.40 and 519,056,548.80 is: 779,487,188.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,221,572.80 : 1,469,032,970.40 = 519,056,548.80 : x
  2. Step 2: Convert to fraction form
    978,221,572.80/1,469,032,970.40 = 519,056,548.80/x
  3. Step 3: Cross multiply
    978,221,572.80x = 1,469,032,970.40 × 519,056,548.80
  4. Step 4: Simplify right side
    978,221,572.80x = 762,511,183,689,236,608
  5. Step 5: Solve for x
    x = 762,511,183,689,236,608/978,221,572.80
  6. Step 6: Final answer
    x = 779,487,188.68

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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.