Home / 100,354.12-138,385.30-70,128.36

Finding the Fourth Proportional to 100,354.12, 138,385.30 and 70,128.36

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Solution

The fourth proportional to 100,354.12, 138,385.30 and 70,128.36 is: 96,704.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,354.12 : 138,385.30 = 70,128.36 : x
  2. Step 2: Convert to fraction form
    100,354.12/138,385.30 = 70,128.36/x
  3. Step 3: Cross multiply
    100,354.12x = 138,385.30 × 70,128.36
  4. Step 4: Simplify right side
    100,354.12x = 9,704,734,137.11
  5. Step 5: Solve for x
    x = 9,704,734,137.11/100,354.12
  6. Step 6: Final answer
    x = 96,704.89

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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.