Home / 100,421.51-138,582.18-55,103.63

Finding the Fourth Proportional to 100,421.51, 138,582.18 and 55,103.63

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Solution

The fourth proportional to 100,421.51, 138,582.18 and 55,103.63 is: 76,043.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,421.51 : 138,582.18 = 55,103.63 : x
  2. Step 2: Convert to fraction form
    100,421.51/138,582.18 = 55,103.63/x
  3. Step 3: Cross multiply
    100,421.51x = 138,582.18 × 55,103.63
  4. Step 4: Simplify right side
    100,421.51x = 7,636,380,478.40
  5. Step 5: Solve for x
    x = 7,636,380,478.40/100,421.51
  6. Step 6: Final answer
    x = 76,043.28

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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.