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Finding the Fourth Proportional to 91,111.60, 136,539.40 and 72,423.60

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Solution

The fourth proportional to 91,111.60, 136,539.40 and 72,423.60 is: 108,533.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,111.60 : 136,539.40 = 72,423.60 : x
  2. Step 2: Convert to fraction form
    91,111.60/136,539.40 = 72,423.60/x
  3. Step 3: Cross multiply
    91,111.60x = 136,539.40 × 72,423.60
  4. Step 4: Simplify right side
    91,111.60x = 9,888,674,889.84
  5. Step 5: Solve for x
    x = 9,888,674,889.84/91,111.60
  6. Step 6: Final answer
    x = 108,533.65

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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.