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Finding the Fourth Proportional to 28,259.76, 38,993.40 and 18,318

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Solution

The fourth proportional to 28,259.76, 38,993.40 and 18,318 is: 25,275.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,259.76 : 38,993.40 = 18,318 : x
  2. Step 2: Convert to fraction form
    28,259.76/38,993.40 = 18,318/x
  3. Step 3: Cross multiply
    28,259.76x = 38,993.40 × 18,318
  4. Step 4: Simplify right side
    28,259.76x = 714,281,101.20
  5. Step 5: Solve for x
    x = 714,281,101.20/28,259.76
  6. Step 6: Final answer
    x = 25,275.55

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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.