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Finding the Fourth Proportional to 78,696.69, 108,601.45 and 42,886.71

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Solution

The fourth proportional to 78,696.69, 108,601.45 and 42,886.71 is: 59,183.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,696.69 : 108,601.45 = 42,886.71 : x
  2. Step 2: Convert to fraction form
    78,696.69/108,601.45 = 42,886.71/x
  3. Step 3: Cross multiply
    78,696.69x = 108,601.45 × 42,886.71
  4. Step 4: Simplify right side
    78,696.69x = 4,657,558,784.51
  5. Step 5: Solve for x
    x = 4,657,558,784.51/78,696.69
  6. Step 6: Final answer
    x = 59,183.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.