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Finding the Fourth Proportional to 72,775.16, 109,128.57 and 39,486.29

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Solution

The fourth proportional to 72,775.16, 109,128.57 and 39,486.29 is: 59,210.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,775.16 : 109,128.57 = 39,486.29 : x
  2. Step 2: Convert to fraction form
    72,775.16/109,128.57 = 39,486.29/x
  3. Step 3: Cross multiply
    72,775.16x = 109,128.57 × 39,486.29
  4. Step 4: Simplify right side
    72,775.16x = 4,309,081,668.59
  5. Step 5: Solve for x
    x = 4,309,081,668.59/72,775.16
  6. Step 6: Final answer
    x = 59,210.89

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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.