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Finding the Fourth Proportional to 18,985.32, 28,484.07 and 9,125.31

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Solution

The fourth proportional to 18,985.32, 28,484.07 and 9,125.31 is: 13,690.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.32 : 28,484.07 = 9,125.31 : x
  2. Step 2: Convert to fraction form
    18,985.32/28,484.07 = 9,125.31/x
  3. Step 3: Cross multiply
    18,985.32x = 28,484.07 × 9,125.31
  4. Step 4: Simplify right side
    18,985.32x = 259,925,968.81
  5. Step 5: Solve for x
    x = 259,925,968.81/18,985.32
  6. Step 6: Final answer
    x = 13,690.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.