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Finding the Fourth Proportional to 18,271.78, 25,215.12 and 9,888.28

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Solution

The fourth proportional to 18,271.78, 25,215.12 and 9,888.28 is: 13,645.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,271.78 : 25,215.12 = 9,888.28 : x
  2. Step 2: Convert to fraction form
    18,271.78/25,215.12 = 9,888.28/x
  3. Step 3: Cross multiply
    18,271.78x = 25,215.12 × 9,888.28
  4. Step 4: Simplify right side
    18,271.78x = 249,334,166.79
  5. Step 5: Solve for x
    x = 249,334,166.79/18,271.78
  6. Step 6: Final answer
    x = 13,645.86

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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.