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Finding the Fourth Proportional to 153,855.25, 212,152.87 and 100,040.47

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Solution

The fourth proportional to 153,855.25, 212,152.87 and 100,040.47 is: 137,947.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,855.25 : 212,152.87 = 100,040.47 : x
  2. Step 2: Convert to fraction form
    153,855.25/212,152.87 = 100,040.47/x
  3. Step 3: Cross multiply
    153,855.25x = 212,152.87 × 100,040.47
  4. Step 4: Simplify right side
    153,855.25x = 21,223,872,455.27
  5. Step 5: Solve for x
    x = 21,223,872,455.27/153,855.25
  6. Step 6: Final answer
    x = 137,947.01

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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.