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Finding the Fourth Proportional to 315,012.50, 472,518.75 and 81,540.50

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Solution

The fourth proportional to 315,012.50, 472,518.75 and 81,540.50 is: 122,310.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,012.50 : 472,518.75 = 81,540.50 : x
  2. Step 2: Convert to fraction form
    315,012.50/472,518.75 = 81,540.50/x
  3. Step 3: Cross multiply
    315,012.50x = 472,518.75 × 81,540.50
  4. Step 4: Simplify right side
    315,012.50x = 38,529,415,134.38
  5. Step 5: Solve for x
    x = 38,529,415,134.38/315,012.50
  6. Step 6: Final answer
    x = 122,310.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.