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Finding the Fourth Proportional to 78,810.40, 118,215.60 and 76,623.40

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Solution

The fourth proportional to 78,810.40, 118,215.60 and 76,623.40 is: 114,935.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,810.40 : 118,215.60 = 76,623.40 : x
  2. Step 2: Convert to fraction form
    78,810.40/118,215.60 = 76,623.40/x
  3. Step 3: Cross multiply
    78,810.40x = 118,215.60 × 76,623.40
  4. Step 4: Simplify right side
    78,810.40x = 9,058,081,205.04
  5. Step 5: Solve for x
    x = 9,058,081,205.04/78,810.40
  6. Step 6: Final answer
    x = 114,935.10

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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.