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Finding the Fourth Proportional to 100,731.04, 139,012.14 and 55,412.50

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Solution

The fourth proportional to 100,731.04, 139,012.14 and 55,412.50 is: 76,471.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,731.04 : 139,012.14 = 55,412.50 : x
  2. Step 2: Convert to fraction form
    100,731.04/139,012.14 = 55,412.50/x
  3. Step 3: Cross multiply
    100,731.04x = 139,012.14 × 55,412.50
  4. Step 4: Simplify right side
    100,731.04x = 7,703,010,207.75
  5. Step 5: Solve for x
    x = 7,703,010,207.75/100,731.04
  6. Step 6: Final answer
    x = 76,471.07

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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.