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Finding the Fourth Proportional to 139,148.61, 208,731.60 and 39,316.47

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Solution

The fourth proportional to 139,148.61, 208,731.60 and 39,316.47 is: 58,977.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,148.61 : 208,731.60 = 39,316.47 : x
  2. Step 2: Convert to fraction form
    139,148.61/208,731.60 = 39,316.47/x
  3. Step 3: Cross multiply
    139,148.61x = 208,731.60 × 39,316.47
  4. Step 4: Simplify right side
    139,148.61x = 8,206,589,689.45
  5. Step 5: Solve for x
    x = 8,206,589,689.45/139,148.61
  6. Step 6: Final answer
    x = 58,977.16

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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.