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Finding the Fourth Proportional to 78,485.04, 117,726.48 and 19,321.20

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Solution

The fourth proportional to 78,485.04, 117,726.48 and 19,321.20 is: 28,981.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,485.04 : 117,726.48 = 19,321.20 : x
  2. Step 2: Convert to fraction form
    78,485.04/117,726.48 = 19,321.20/x
  3. Step 3: Cross multiply
    78,485.04x = 117,726.48 × 19,321.20
  4. Step 4: Simplify right side
    78,485.04x = 2,274,616,865.38
  5. Step 5: Solve for x
    x = 2,274,616,865.38/78,485.04
  6. Step 6: Final answer
    x = 28,981.53

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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.