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Finding the Fourth Proportional to 280,573,985.80, 420,860,978.70 and 275,791,016.80

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Solution

The fourth proportional to 280,573,985.80, 420,860,978.70 and 275,791,016.80 is: 413,686,525.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,573,985.80 : 420,860,978.70 = 275,791,016.80 : x
  2. Step 2: Convert to fraction form
    280,573,985.80/420,860,978.70 = 275,791,016.80/x
  3. Step 3: Cross multiply
    280,573,985.80x = 420,860,978.70 × 275,791,016.80
  4. Step 4: Simplify right side
    280,573,985.80x = 116,069,677,247,116,144
  5. Step 5: Solve for x
    x = 116,069,677,247,116,144/280,573,985.80
  6. Step 6: Final answer
    x = 413,686,525.20

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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.