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Finding the Fourth Proportional to 12,409.52, 17,122.73 and 7,929.81

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Solution

The fourth proportional to 12,409.52, 17,122.73 and 7,929.81 is: 10,941.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,409.52 : 17,122.73 = 7,929.81 : x
  2. Step 2: Convert to fraction form
    12,409.52/17,122.73 = 7,929.81/x
  3. Step 3: Cross multiply
    12,409.52x = 17,122.73 × 7,929.81
  4. Step 4: Simplify right side
    12,409.52x = 135,779,955.93
  5. Step 5: Solve for x
    x = 135,779,955.93/12,409.52
  6. Step 6: Final answer
    x = 10,941.60

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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.