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Finding the Fourth Proportional to 18,731.63, 28,111.28 and 8,870.90

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Solution

The fourth proportional to 18,731.63, 28,111.28 and 8,870.90 is: 13,312.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,731.63 : 28,111.28 = 8,870.90 : x
  2. Step 2: Convert to fraction form
    18,731.63/28,111.28 = 8,870.90/x
  3. Step 3: Cross multiply
    18,731.63x = 28,111.28 × 8,870.90
  4. Step 4: Simplify right side
    18,731.63x = 249,372,168.84
  5. Step 5: Solve for x
    x = 249,372,168.84/18,731.63
  6. Step 6: Final answer
    x = 13,312.89

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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.