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Finding the Fourth Proportional to 15,818.65, 21,828.69 and 9,103.19

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Solution

The fourth proportional to 15,818.65, 21,828.69 and 9,103.19 is: 12,561.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,818.65 : 21,828.69 = 9,103.19 : x
  2. Step 2: Convert to fraction form
    15,818.65/21,828.69 = 9,103.19/x
  3. Step 3: Cross multiply
    15,818.65x = 21,828.69 × 9,103.19
  4. Step 4: Simplify right side
    15,818.65x = 198,710,712.52
  5. Step 5: Solve for x
    x = 198,710,712.52/15,818.65
  6. Step 6: Final answer
    x = 12,561.80

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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.