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Finding the Fourth Proportional to 78,688.69, 118,026.65 and 31,301.87

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Solution

The fourth proportional to 78,688.69, 118,026.65 and 31,301.87 is: 46,950.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,688.69 : 118,026.65 = 31,301.87 : x
  2. Step 2: Convert to fraction form
    78,688.69/118,026.65 = 31,301.87/x
  3. Step 3: Cross multiply
    78,688.69x = 118,026.65 × 31,301.87
  4. Step 4: Simplify right side
    78,688.69x = 3,694,454,342.96
  5. Step 5: Solve for x
    x = 3,694,454,342.96/78,688.69
  6. Step 6: Final answer
    x = 46,950.26

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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.