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Finding the Fourth Proportional to 72,308.60, 108,479.10 and 27,931.40

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Solution

The fourth proportional to 72,308.60, 108,479.10 and 27,931.40 is: 41,903.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,308.60 : 108,479.10 = 27,931.40 : x
  2. Step 2: Convert to fraction form
    72,308.60/108,479.10 = 27,931.40/x
  3. Step 3: Cross multiply
    72,308.60x = 108,479.10 × 27,931.40
  4. Step 4: Simplify right side
    72,308.60x = 3,029,973,133.74
  5. Step 5: Solve for x
    x = 3,029,973,133.74/72,308.60
  6. Step 6: Final answer
    x = 41,903.36

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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.