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Finding the Fourth Proportional to 78,458.79, 117,688.20 and 19,295.58

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Solution

The fourth proportional to 78,458.79, 117,688.20 and 19,295.58 is: 28,943.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,458.79 : 117,688.20 = 19,295.58 : x
  2. Step 2: Convert to fraction form
    78,458.79/117,688.20 = 19,295.58/x
  3. Step 3: Cross multiply
    78,458.79x = 117,688.20 × 19,295.58
  4. Step 4: Simplify right side
    78,458.79x = 2,270,862,078.16
  5. Step 5: Solve for x
    x = 2,270,862,078.16/78,458.79
  6. Step 6: Final answer
    x = 28,943.37

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Similar ratio
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1.5x scale

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.