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Finding the Fourth Proportional to 71,980.09, 99,328.02 and 39,715.09

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Solution

The fourth proportional to 71,980.09, 99,328.02 and 39,715.09 is: 54,804.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,980.09 : 99,328.02 = 39,715.09 : x
  2. Step 2: Convert to fraction form
    71,980.09/99,328.02 = 39,715.09/x
  3. Step 3: Cross multiply
    71,980.09x = 99,328.02 × 39,715.09
  4. Step 4: Simplify right side
    71,980.09x = 3,944,821,253.82
  5. Step 5: Solve for x
    x = 3,944,821,253.82/71,980.09
  6. Step 6: Final answer
    x = 54,804.34

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1.5x scale

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.