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Finding the Fourth Proportional to 103,639.65, 155,459.48 and 78,756.45

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Solution

The fourth proportional to 103,639.65, 155,459.48 and 78,756.45 is: 118,134.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.65 : 155,459.48 = 78,756.45 : x
  2. Step 2: Convert to fraction form
    103,639.65/155,459.48 = 78,756.45/x
  3. Step 3: Cross multiply
    103,639.65x = 155,459.48 × 78,756.45
  4. Step 4: Simplify right side
    103,639.65x = 12,243,436,369.86
  5. Step 5: Solve for x
    x = 12,243,436,369.86/103,639.65
  6. Step 6: Final answer
    x = 118,134.68

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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.