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Finding the Fourth Proportional to 85,237.40, 128,009.70 and 82,472.60

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Solution

The fourth proportional to 85,237.40, 128,009.70 and 82,472.60 is: 123,857.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,237.40 : 128,009.70 = 82,472.60 : x
  2. Step 2: Convert to fraction form
    85,237.40/128,009.70 = 82,472.60/x
  3. Step 3: Cross multiply
    85,237.40x = 128,009.70 × 82,472.60
  4. Step 4: Simplify right side
    85,237.40x = 10,557,292,784.22
  5. Step 5: Solve for x
    x = 10,557,292,784.22/85,237.40
  6. Step 6: Final answer
    x = 123,857.52

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1.5x scale

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.