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Finding the Fourth Proportional to 77,707.80, 115,994.39 and 66,685.32

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Solution

The fourth proportional to 77,707.80, 115,994.39 and 66,685.32 is: 99,541.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,707.80 : 115,994.39 = 66,685.32 : x
  2. Step 2: Convert to fraction form
    77,707.80/115,994.39 = 66,685.32/x
  3. Step 3: Cross multiply
    77,707.80x = 115,994.39 × 66,685.32
  4. Step 4: Simplify right side
    77,707.80x = 7,735,122,681.93
  5. Step 5: Solve for x
    x = 7,735,122,681.93/77,707.80
  6. Step 6: Final answer
    x = 99,541.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.