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Finding the Fourth Proportional to 390,892,814.55, 586,338,751.35 and 99,759,968.55

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Solution

The fourth proportional to 390,892,814.55, 586,338,751.35 and 99,759,968.55 is: 149,639,832.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,892,814.55 : 586,338,751.35 = 99,759,968.55 : x
  2. Step 2: Convert to fraction form
    390,892,814.55/586,338,751.35 = 99,759,968.55/x
  3. Step 3: Cross multiply
    390,892,814.55x = 586,338,751.35 × 99,759,968.55
  4. Step 4: Simplify right side
    390,892,814.55x = 58,493,135,394,322,272
  5. Step 5: Solve for x
    x = 58,493,135,394,322,272/390,892,814.55
  6. Step 6: Final answer
    x = 149,639,832.75

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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.