Home / 390,490,106-585,769,201.68-128,095,984.40

Finding the Fourth Proportional to 390,490,106, 585,769,201.68 and 128,095,984.40

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Solution

The fourth proportional to 390,490,106, 585,769,201.68 and 128,095,984.40 is: 192,155,143.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,490,106 : 585,769,201.68 = 128,095,984.40 : x
  2. Step 2: Convert to fraction form
    390,490,106/585,769,201.68 = 128,095,984.40/x
  3. Step 3: Cross multiply
    390,490,106x = 585,769,201.68 × 128,095,984.40
  4. Step 4: Simplify right side
    390,490,106x = 75,034,682,520,401,728
  5. Step 5: Solve for x
    x = 75,034,682,520,401,728/390,490,106
  6. Step 6: Final answer
    x = 192,155,143.93

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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.