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Finding the Fourth Proportional to 15,699.51, 21,686.81 and 12,751.92

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Solution

The fourth proportional to 15,699.51, 21,686.81 and 12,751.92 is: 17,615.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,699.51 : 21,686.81 = 12,751.92 : x
  2. Step 2: Convert to fraction form
    15,699.51/21,686.81 = 12,751.92/x
  3. Step 3: Cross multiply
    15,699.51x = 21,686.81 × 12,751.92
  4. Step 4: Simplify right side
    15,699.51x = 276,548,402.42
  5. Step 5: Solve for x
    x = 276,548,402.42/15,699.51
  6. Step 6: Final answer
    x = 17,615.10

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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.