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Finding the Fourth Proportional to 153,940.32, 212,377.68 and 103,672.80

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Solution

The fourth proportional to 153,940.32, 212,377.68 and 103,672.80 is: 143,028.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,940.32 : 212,377.68 = 103,672.80 : x
  2. Step 2: Convert to fraction form
    153,940.32/212,377.68 = 103,672.80/x
  3. Step 3: Cross multiply
    153,940.32x = 212,377.68 × 103,672.80
  4. Step 4: Simplify right side
    153,940.32x = 22,017,788,743.10
  5. Step 5: Solve for x
    x = 22,017,788,743.10/153,940.32
  6. Step 6: Final answer
    x = 143,028.08

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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.