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Finding the Fourth Proportional to 92,767.91, 128,139.86 and 68,618

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Solution

The fourth proportional to 92,767.91, 128,139.86 and 68,618 is: 94,781.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,767.91 : 128,139.86 = 68,618 : x
  2. Step 2: Convert to fraction form
    92,767.91/128,139.86 = 68,618/x
  3. Step 3: Cross multiply
    92,767.91x = 128,139.86 × 68,618
  4. Step 4: Simplify right side
    92,767.91x = 8,792,700,570.39
  5. Step 5: Solve for x
    x = 8,792,700,570.39/92,767.91
  6. Step 6: Final answer
    x = 94,781.70

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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.