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Finding the Fourth Proportional to 661,581,703.80, 990,860,901.30 and 389,483,911.80

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Solution

The fourth proportional to 661,581,703.80, 990,860,901.30 and 389,483,911.80 is: 583,335,932.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,581,703.80 : 990,860,901.30 = 389,483,911.80 : x
  2. Step 2: Convert to fraction form
    661,581,703.80/990,860,901.30 = 389,483,911.80/x
  3. Step 3: Cross multiply
    661,581,703.80x = 990,860,901.30 × 389,483,911.80
  4. Step 4: Simplify right side
    661,581,703.80x = 385,924,379,887,997,696
  5. Step 5: Solve for x
    x = 385,924,379,887,997,696/661,581,703.80
  6. Step 6: Final answer
    x = 583,335,932.16

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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.