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Finding the Fourth Proportional to 145,643,978.65, 200,991,653.38 and 79,568,756.59

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Solution

The fourth proportional to 145,643,978.65, 200,991,653.38 and 79,568,756.59 is: 109,806,502.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,643,978.65 : 200,991,653.38 = 79,568,756.59 : x
  2. Step 2: Convert to fraction form
    145,643,978.65/200,991,653.38 = 79,568,756.59/x
  3. Step 3: Cross multiply
    145,643,978.65x = 200,991,653.38 × 79,568,756.59
  4. Step 4: Simplify right side
    145,643,978.65x = 15,992,655,944,414,872
  5. Step 5: Solve for x
    x = 15,992,655,944,414,872/145,643,978.65
  6. Step 6: Final answer
    x = 109,806,502.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.