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Finding the Fourth Proportional to 78,640, 108,523.20 and 43,312

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Solution

The fourth proportional to 78,640, 108,523.20 and 43,312 is: 59,770.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,640 : 108,523.20 = 43,312 : x
  2. Step 2: Convert to fraction form
    78,640/108,523.20 = 43,312/x
  3. Step 3: Cross multiply
    78,640x = 108,523.20 × 43,312
  4. Step 4: Simplify right side
    78,640x = 4,700,356,838.40
  5. Step 5: Solve for x
    x = 4,700,356,838.40/78,640
  6. Step 6: Final answer
    x = 59,770.56

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.