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Finding the Fourth Proportional to 145,813.39, 201,222.49 and 78,745.39

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Solution

The fourth proportional to 145,813.39, 201,222.49 and 78,745.39 is: 108,668.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,813.39 : 201,222.49 = 78,745.39 : x
  2. Step 2: Convert to fraction form
    145,813.39/201,222.49 = 78,745.39/x
  3. Step 3: Cross multiply
    145,813.39x = 201,222.49 × 78,745.39
  4. Step 4: Simplify right side
    145,813.39x = 15,845,343,451.82
  5. Step 5: Solve for x
    x = 15,845,343,451.82/145,813.39
  6. Step 6: Final answer
    x = 108,668.64

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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.