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Finding the Fourth Proportional to 72,491.20, 108,607.20 and 61,345.60

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Solution

The fourth proportional to 72,491.20, 108,607.20 and 61,345.60 is: 91,908.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,491.20 : 108,607.20 = 61,345.60 : x
  2. Step 2: Convert to fraction form
    72,491.20/108,607.20 = 61,345.60/x
  3. Step 3: Cross multiply
    72,491.20x = 108,607.20 × 61,345.60
  4. Step 4: Simplify right side
    72,491.20x = 6,662,573,848.32
  5. Step 5: Solve for x
    x = 6,662,573,848.32/72,491.20
  6. Step 6: Final answer
    x = 91,908.73

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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.