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Finding the Fourth Proportional to 57,172.59, 78,869.16 and 39,009.69

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Solution

The fourth proportional to 57,172.59, 78,869.16 and 39,009.69 is: 53,813.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,172.59 : 78,869.16 = 39,009.69 : x
  2. Step 2: Convert to fraction form
    57,172.59/78,869.16 = 39,009.69/x
  3. Step 3: Cross multiply
    57,172.59x = 78,869.16 × 39,009.69
  4. Step 4: Simplify right side
    57,172.59x = 3,076,661,482.16
  5. Step 5: Solve for x
    x = 3,076,661,482.16/57,172.59
  6. Step 6: Final answer
    x = 53,813.58

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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.