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Finding the Fourth Proportional to 103,428.30, 155,178.90 and 99,783.30

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Solution

The fourth proportional to 103,428.30, 155,178.90 and 99,783.30 is: 149,710.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,428.30 : 155,178.90 = 99,783.30 : x
  2. Step 2: Convert to fraction form
    103,428.30/155,178.90 = 99,783.30/x
  3. Step 3: Cross multiply
    103,428.30x = 155,178.90 × 99,783.30
  4. Step 4: Simplify right side
    103,428.30x = 15,484,262,732.37
  5. Step 5: Solve for x
    x = 15,484,262,732.37/103,428.30
  6. Step 6: Final answer
    x = 149,710.12

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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.