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Finding the Fourth Proportional to 664,851,261.80, 997,276,892.70 and 389,352,247.40

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Solution

The fourth proportional to 664,851,261.80, 997,276,892.70 and 389,352,247.40 is: 584,028,371.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,851,261.80 : 997,276,892.70 = 389,352,247.40 : x
  2. Step 2: Convert to fraction form
    664,851,261.80/997,276,892.70 = 389,352,247.40/x
  3. Step 3: Cross multiply
    664,851,261.80x = 997,276,892.70 × 389,352,247.40
  4. Step 4: Simplify right side
    664,851,261.80x = 388,291,999,452,833,664
  5. Step 5: Solve for x
    x = 388,291,999,452,833,664/664,851,261.80
  6. Step 6: Final answer
    x = 584,028,371.10

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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.