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Finding the Fourth Proportional to 154,653.21, 213,357.65 and 100,918.89

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Solution

The fourth proportional to 154,653.21, 213,357.65 and 100,918.89 is: 139,226.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,653.21 : 213,357.65 = 100,918.89 : x
  2. Step 2: Convert to fraction form
    154,653.21/213,357.65 = 100,918.89/x
  3. Step 3: Cross multiply
    154,653.21x = 213,357.65 × 100,918.89
  4. Step 4: Simplify right side
    154,653.21x = 21,531,816,706.41
  5. Step 5: Solve for x
    x = 21,531,816,706.41/154,653.21
  6. Step 6: Final answer
    x = 139,226.45

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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.