Home / 30,570.72-42,195.09-18,640.63

Finding the Fourth Proportional to 30,570.72, 42,195.09 and 18,640.63

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Solution

The fourth proportional to 30,570.72, 42,195.09 and 18,640.63 is: 25,728.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,570.72 : 42,195.09 = 18,640.63 : x
  2. Step 2: Convert to fraction form
    30,570.72/42,195.09 = 18,640.63/x
  3. Step 3: Cross multiply
    30,570.72x = 42,195.09 × 18,640.63
  4. Step 4: Simplify right side
    30,570.72x = 786,543,060.51
  5. Step 5: Solve for x
    x = 786,543,060.51/30,570.72
  6. Step 6: Final answer
    x = 25,728.64

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Double scale
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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.