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Finding the Fourth Proportional to 118,898.40, 163,973.52 and 78,653.28

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Solution

The fourth proportional to 118,898.40, 163,973.52 and 78,653.28 is: 108,471.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,898.40 : 163,973.52 = 78,653.28 : x
  2. Step 2: Convert to fraction form
    118,898.40/163,973.52 = 78,653.28/x
  3. Step 3: Cross multiply
    118,898.40x = 163,973.52 × 78,653.28
  4. Step 4: Simplify right side
    118,898.40x = 12,897,055,181.15
  5. Step 5: Solve for x
    x = 12,897,055,181.15/118,898.40
  6. Step 6: Final answer
    x = 108,471.23

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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.