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Finding the Fourth Proportional to 100,690.86, 138,950.45 and 55,368.80

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Solution

The fourth proportional to 100,690.86, 138,950.45 and 55,368.80 is: 76,407.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,690.86 : 138,950.45 = 55,368.80 : x
  2. Step 2: Convert to fraction form
    100,690.86/138,950.45 = 55,368.80/x
  3. Step 3: Cross multiply
    100,690.86x = 138,950.45 × 55,368.80
  4. Step 4: Simplify right side
    100,690.86x = 7,693,519,744.51
  5. Step 5: Solve for x
    x = 7,693,519,744.51/100,690.86
  6. Step 6: Final answer
    x = 76,407.33

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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.