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Finding the Fourth Proportional to 64,985.04, 89,685.39 and 39,485.54

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Solution

The fourth proportional to 64,985.04, 89,685.39 and 39,485.54 is: 54,493.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,985.04 : 89,685.39 = 39,485.54 : x
  2. Step 2: Convert to fraction form
    64,985.04/89,685.39 = 39,485.54/x
  3. Step 3: Cross multiply
    64,985.04x = 89,685.39 × 39,485.54
  4. Step 4: Simplify right side
    64,985.04x = 3,541,275,605.83
  5. Step 5: Solve for x
    x = 3,541,275,605.83/64,985.04
  6. Step 6: Final answer
    x = 54,493.71

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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.