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Finding the Fourth Proportional to 78,153.66, 107,792.54 and 67,270.32

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Solution

The fourth proportional to 78,153.66, 107,792.54 and 67,270.32 is: 92,781.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,153.66 : 107,792.54 = 67,270.32 : x
  2. Step 2: Convert to fraction form
    78,153.66/107,792.54 = 67,270.32/x
  3. Step 3: Cross multiply
    78,153.66x = 107,792.54 × 67,270.32
  4. Step 4: Simplify right side
    78,153.66x = 7,251,238,659.41
  5. Step 5: Solve for x
    x = 7,251,238,659.41/78,153.66
  6. Step 6: Final answer
    x = 92,781.82

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1.5x scale

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.