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Finding the Fourth Proportional to 485,816,078.40, 728,892,079.20 and 469,019,918.40

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Solution

The fourth proportional to 485,816,078.40, 728,892,079.20 and 469,019,918.40 is: 703,692,032.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,816,078.40 : 728,892,079.20 = 469,019,918.40 : x
  2. Step 2: Convert to fraction form
    485,816,078.40/728,892,079.20 = 469,019,918.40/x
  3. Step 3: Cross multiply
    485,816,078.40x = 728,892,079.20 × 469,019,918.40
  4. Step 4: Simplify right side
    485,816,078.40x = 341,864,903,508,790,336
  5. Step 5: Solve for x
    x = 341,864,903,508,790,336/485,816,078.40
  6. Step 6: Final answer
    x = 703,692,032.25

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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.