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Finding the Fourth Proportional to 15,265.30, 21,065.73 and 8,978.06

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Solution

The fourth proportional to 15,265.30, 21,065.73 and 8,978.06 is: 12,389.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,265.30 : 21,065.73 = 8,978.06 : x
  2. Step 2: Convert to fraction form
    15,265.30/21,065.73 = 8,978.06/x
  3. Step 3: Cross multiply
    15,265.30x = 21,065.73 × 8,978.06
  4. Step 4: Simplify right side
    15,265.30x = 189,129,387.88
  5. Step 5: Solve for x
    x = 189,129,387.88/15,265.30
  6. Step 6: Final answer
    x = 12,389.50

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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.