Home / 38,780.19-53,513.86-21,783.55

Finding the Fourth Proportional to 38,780.19, 53,513.86 and 21,783.55

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Solution

The fourth proportional to 38,780.19, 53,513.86 and 21,783.55 is: 30,059.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,780.19 : 53,513.86 = 21,783.55 : x
  2. Step 2: Convert to fraction form
    38,780.19/53,513.86 = 21,783.55/x
  3. Step 3: Cross multiply
    38,780.19x = 53,513.86 × 21,783.55
  4. Step 4: Simplify right side
    38,780.19x = 1,165,721,845.00
  5. Step 5: Solve for x
    x = 1,165,721,845.00/38,780.19
  6. Step 6: Final answer
    x = 30,059.72

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Double scale
Find fourth proportional to 38,781.19, 53,515.24 and 21,784.55
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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.