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Finding the Fourth Proportional to 55,479.76, 83,215.80 and 20,412.88

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Solution

The fourth proportional to 55,479.76, 83,215.80 and 20,412.88 is: 30,617.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,479.76 : 83,215.80 = 20,412.88 : x
  2. Step 2: Convert to fraction form
    55,479.76/83,215.80 = 20,412.88/x
  3. Step 3: Cross multiply
    55,479.76x = 83,215.80 × 20,412.88
  4. Step 4: Simplify right side
    55,479.76x = 1,698,674,139.50
  5. Step 5: Solve for x
    x = 1,698,674,139.50/55,479.76
  6. Step 6: Final answer
    x = 30,617.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.