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Finding the Fourth Proportional to 990,859,359.60, 1,486,289,039.40 and 664,342,009.20

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Solution

The fourth proportional to 990,859,359.60, 1,486,289,039.40 and 664,342,009.20 is: 996,513,013.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    990,859,359.60 : 1,486,289,039.40 = 664,342,009.20 : x
  2. Step 2: Convert to fraction form
    990,859,359.60/1,486,289,039.40 = 664,342,009.20/x
  3. Step 3: Cross multiply
    990,859,359.60x = 1,486,289,039.40 × 664,342,009.20
  4. Step 4: Simplify right side
    990,859,359.60x = 987,404,246,686,934,144
  5. Step 5: Solve for x
    x = 987,404,246,686,934,144/990,859,359.60
  6. Step 6: Final answer
    x = 996,513,013.80

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1.5x scale

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.