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Finding the Fourth Proportional to 328,258.61, 492,440.40 and 138,720.81

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Solution

The fourth proportional to 328,258.61, 492,440.40 and 138,720.81 is: 208,103.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,258.61 : 492,440.40 = 138,720.81 : x
  2. Step 2: Convert to fraction form
    328,258.61/492,440.40 = 138,720.81/x
  3. Step 3: Cross multiply
    328,258.61x = 492,440.40 × 138,720.81
  4. Step 4: Simplify right side
    328,258.61x = 68,311,731,164.72
  5. Step 5: Solve for x
    x = 68,311,731,164.72/328,258.61
  6. Step 6: Final answer
    x = 208,103.40

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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.