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Finding the Fourth Proportional to 39,152.40, 58,728.60 and 12,859.80

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Solution

The fourth proportional to 39,152.40, 58,728.60 and 12,859.80 is: 19,289.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,152.40 : 58,728.60 = 12,859.80 : x
  2. Step 2: Convert to fraction form
    39,152.40/58,728.60 = 12,859.80/x
  3. Step 3: Cross multiply
    39,152.40x = 58,728.60 × 12,859.80
  4. Step 4: Simplify right side
    39,152.40x = 755,238,050.28
  5. Step 5: Solve for x
    x = 755,238,050.28/39,152.40
  6. Step 6: Final answer
    x = 19,289.70

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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.