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Finding the Fourth Proportional to 78,898.51, 118,343.76 and 28,974.79

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Solution

The fourth proportional to 78,898.51, 118,343.76 and 28,974.79 is: 43,460.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,898.51 : 118,343.76 = 28,974.79 : x
  2. Step 2: Convert to fraction form
    78,898.51/118,343.76 = 28,974.79/x
  3. Step 3: Cross multiply
    78,898.51x = 118,343.76 × 28,974.79
  4. Step 4: Simplify right side
    78,898.51x = 3,428,985,593.81
  5. Step 5: Solve for x
    x = 3,428,985,593.81/78,898.51
  6. Step 6: Final answer
    x = 43,460.71

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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.