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Finding the Fourth Proportional to 328,880.81, 493,235.58 and 139,243.56

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Solution

The fourth proportional to 328,880.81, 493,235.58 and 139,243.56 is: 208,829.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,880.81 : 493,235.58 = 139,243.56 : x
  2. Step 2: Convert to fraction form
    328,880.81/493,235.58 = 139,243.56/x
  3. Step 3: Cross multiply
    328,880.81x = 493,235.58 × 139,243.56
  4. Step 4: Simplify right side
    328,880.81x = 68,679,878,077.86
  5. Step 5: Solve for x
    x = 68,679,878,077.86/328,880.81
  6. Step 6: Final answer
    x = 208,829.08

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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.