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Finding the Fourth Proportional to 103,643.20, 155,464.80 and 96,731.20

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Solution

The fourth proportional to 103,643.20, 155,464.80 and 96,731.20 is: 145,096.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,643.20 : 155,464.80 = 96,731.20 : x
  2. Step 2: Convert to fraction form
    103,643.20/155,464.80 = 96,731.20/x
  3. Step 3: Cross multiply
    103,643.20x = 155,464.80 × 96,731.20
  4. Step 4: Simplify right side
    103,643.20x = 15,038,296,661.76
  5. Step 5: Solve for x
    x = 15,038,296,661.76/103,643.20
  6. Step 6: Final answer
    x = 145,096.80

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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.