Home / 38,780.10-53,512.74-21,780.45

Finding the Fourth Proportional to 38,780.10, 53,512.74 and 21,780.45

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Solution

The fourth proportional to 38,780.10, 53,512.74 and 21,780.45 is: 30,054.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,780.10 : 53,512.74 = 21,780.45 : x
  2. Step 2: Convert to fraction form
    38,780.10/53,512.74 = 21,780.45/x
  3. Step 3: Cross multiply
    38,780.10x = 53,512.74 × 21,780.45
  4. Step 4: Simplify right side
    38,780.10x = 1,165,531,557.93
  5. Step 5: Solve for x
    x = 1,165,531,557.93/38,780.10
  6. Step 6: Final answer
    x = 30,054.89

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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.