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Finding the Fourth Proportional to 28,485.67, 39,311.02 and 15,739.68

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Solution

The fourth proportional to 28,485.67, 39,311.02 and 15,739.68 is: 21,721.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,485.67 : 39,311.02 = 15,739.68 : x
  2. Step 2: Convert to fraction form
    28,485.67/39,311.02 = 15,739.68/x
  3. Step 3: Cross multiply
    28,485.67x = 39,311.02 × 15,739.68
  4. Step 4: Simplify right side
    28,485.67x = 618,742,718.07
  5. Step 5: Solve for x
    x = 618,742,718.07/28,485.67
  6. Step 6: Final answer
    x = 21,721.19

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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.