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Finding the Fourth Proportional to 74,965.79, 112,448.70 and 19,561.79

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Solution

The fourth proportional to 74,965.79, 112,448.70 and 19,561.79 is: 29,342.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,965.79 : 112,448.70 = 19,561.79 : x
  2. Step 2: Convert to fraction form
    74,965.79/112,448.70 = 19,561.79/x
  3. Step 3: Cross multiply
    74,965.79x = 112,448.70 × 19,561.79
  4. Step 4: Simplify right side
    74,965.79x = 2,199,698,136.29
  5. Step 5: Solve for x
    x = 2,199,698,136.29/74,965.79
  6. Step 6: Final answer
    x = 29,342.69

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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.