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Finding the Fourth Proportional to 660,174,420.60, 990,261,630.90 and 430,591,908.60

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Solution

The fourth proportional to 660,174,420.60, 990,261,630.90 and 430,591,908.60 is: 645,887,862.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,174,420.60 : 990,261,630.90 = 430,591,908.60 : x
  2. Step 2: Convert to fraction form
    660,174,420.60/990,261,630.90 = 430,591,908.60/x
  3. Step 3: Cross multiply
    660,174,420.60x = 990,261,630.90 × 430,591,908.60
  4. Step 4: Simplify right side
    660,174,420.60x = 426,398,645,662,579,776
  5. Step 5: Solve for x
    x = 426,398,645,662,579,776/660,174,420.60
  6. Step 6: Final answer
    x = 645,887,862.90

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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.