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Finding the Fourth Proportional to 78,107.04, 107,707.07 and 66,813.92

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Solution

The fourth proportional to 78,107.04, 107,707.07 and 66,813.92 is: 92,134.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,107.04 : 107,707.07 = 66,813.92 : x
  2. Step 2: Convert to fraction form
    78,107.04/107,707.07 = 66,813.92/x
  3. Step 3: Cross multiply
    78,107.04x = 107,707.07 × 66,813.92
  4. Step 4: Simplify right side
    78,107.04x = 7,196,330,685.81
  5. Step 5: Solve for x
    x = 7,196,330,685.81/78,107.04
  6. Step 6: Final answer
    x = 92,134.21

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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.