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Finding the Fourth Proportional to 72,990.70, 100,719.64 and 53,880.64

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Solution

The fourth proportional to 72,990.70, 100,719.64 and 53,880.64 is: 74,349.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990.70 : 100,719.64 = 53,880.64 : x
  2. Step 2: Convert to fraction form
    72,990.70/100,719.64 = 53,880.64/x
  3. Step 3: Cross multiply
    72,990.70x = 100,719.64 × 53,880.64
  4. Step 4: Simplify right side
    72,990.70x = 5,426,838,663.77
  5. Step 5: Solve for x
    x = 5,426,838,663.77/72,990.70
  6. Step 6: Final answer
    x = 74,349.73

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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.