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Finding the Fourth Proportional to 91,810.40, 138,007.20 and 86,561.60

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Solution

The fourth proportional to 91,810.40, 138,007.20 and 86,561.60 is: 130,117.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,810.40 : 138,007.20 = 86,561.60 : x
  2. Step 2: Convert to fraction form
    91,810.40/138,007.20 = 86,561.60/x
  3. Step 3: Cross multiply
    91,810.40x = 138,007.20 × 86,561.60
  4. Step 4: Simplify right side
    91,810.40x = 11,946,124,043.52
  5. Step 5: Solve for x
    x = 11,946,124,043.52/91,810.40
  6. Step 6: Final answer
    x = 130,117.33

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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.