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Finding the Fourth Proportional to 72,137.60, 99,618 and 68,210.72

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Solution

The fourth proportional to 72,137.60, 99,618 and 68,210.72 is: 94,195.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,137.60 : 99,618 = 68,210.72 : x
  2. Step 2: Convert to fraction form
    72,137.60/99,618 = 68,210.72/x
  3. Step 3: Cross multiply
    72,137.60x = 99,618 × 68,210.72
  4. Step 4: Simplify right side
    72,137.60x = 6,795,015,504.96
  5. Step 5: Solve for x
    x = 6,795,015,504.96/72,137.60
  6. Step 6: Final answer
    x = 94,195.20

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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.