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Finding the Fourth Proportional to 71,689.58, 98,931.39 and 39,858.47

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Solution

The fourth proportional to 71,689.58, 98,931.39 and 39,858.47 is: 55,004.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,689.58 : 98,931.39 = 39,858.47 : x
  2. Step 2: Convert to fraction form
    71,689.58/98,931.39 = 39,858.47/x
  3. Step 3: Cross multiply
    71,689.58x = 98,931.39 × 39,858.47
  4. Step 4: Simplify right side
    71,689.58x = 3,943,253,840.37
  5. Step 5: Solve for x
    x = 3,943,253,840.37/71,689.58
  6. Step 6: Final answer
    x = 55,004.56

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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.