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Finding the Fourth Proportional to 28,321.76, 39,090.48 and 18,368.48

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Solution

The fourth proportional to 28,321.76, 39,090.48 and 18,368.48 is: 25,352.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,321.76 : 39,090.48 = 18,368.48 : x
  2. Step 2: Convert to fraction form
    28,321.76/39,090.48 = 18,368.48/x
  3. Step 3: Cross multiply
    28,321.76x = 39,090.48 × 18,368.48
  4. Step 4: Simplify right side
    28,321.76x = 718,032,700.07
  5. Step 5: Solve for x
    x = 718,032,700.07/28,321.76
  6. Step 6: Final answer
    x = 25,352.69

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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.