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Finding the Fourth Proportional to 15,510.99, 21,406.59 and 8,798.79

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Solution

The fourth proportional to 15,510.99, 21,406.59 and 8,798.79 is: 12,143.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,510.99 : 21,406.59 = 8,798.79 : x
  2. Step 2: Convert to fraction form
    15,510.99/21,406.59 = 8,798.79/x
  3. Step 3: Cross multiply
    15,510.99x = 21,406.59 × 8,798.79
  4. Step 4: Simplify right side
    15,510.99x = 188,352,090.03
  5. Step 5: Solve for x
    x = 188,352,090.03/15,510.99
  6. Step 6: Final answer
    x = 12,143.14

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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.