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Finding the Fourth Proportional to 128,501.70, 192,762.30 and 39,764.18

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Solution

The fourth proportional to 128,501.70, 192,762.30 and 39,764.18 is: 59,649.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,501.70 : 192,762.30 = 39,764.18 : x
  2. Step 2: Convert to fraction form
    128,501.70/192,762.30 = 39,764.18/x
  3. Step 3: Cross multiply
    128,501.70x = 192,762.30 × 39,764.18
  4. Step 4: Simplify right side
    128,501.70x = 7,665,034,794.41
  5. Step 5: Solve for x
    x = 7,665,034,794.41/128,501.70
  6. Step 6: Final answer
    x = 59,649.29

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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.