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Finding the Fourth Proportional to 78,643.52, 117,971.96 and 69,392.51

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Solution

The fourth proportional to 78,643.52, 117,971.96 and 69,392.51 is: 104,094.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,643.52 : 117,971.96 = 69,392.51 : x
  2. Step 2: Convert to fraction form
    78,643.52/117,971.96 = 69,392.51/x
  3. Step 3: Cross multiply
    78,643.52x = 117,971.96 × 69,392.51
  4. Step 4: Simplify right side
    78,643.52x = 8,186,369,477.20
  5. Step 5: Solve for x
    x = 8,186,369,477.20/78,643.52
  6. Step 6: Final answer
    x = 104,094.65

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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.