Home / 28,415.56-39,214.80-15,840.40

Finding the Fourth Proportional to 28,415.56, 39,214.80 and 15,840.40

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Solution

The fourth proportional to 28,415.56, 39,214.80 and 15,840.40 is: 21,860.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,415.56 : 39,214.80 = 15,840.40 : x
  2. Step 2: Convert to fraction form
    28,415.56/39,214.80 = 15,840.40/x
  3. Step 3: Cross multiply
    28,415.56x = 39,214.80 × 15,840.40
  4. Step 4: Simplify right side
    28,415.56x = 621,178,117.92
  5. Step 5: Solve for x
    x = 621,178,117.92/28,415.56
  6. Step 6: Final answer
    x = 21,860.49

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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.