Home / 100,130.58-138,179.52-57,688.20

Finding the Fourth Proportional to 100,130.58, 138,179.52 and 57,688.20

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Solution

The fourth proportional to 100,130.58, 138,179.52 and 57,688.20 is: 79,609.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,130.58 : 138,179.52 = 57,688.20 : x
  2. Step 2: Convert to fraction form
    100,130.58/138,179.52 = 57,688.20/x
  3. Step 3: Cross multiply
    100,130.58x = 138,179.52 × 57,688.20
  4. Step 4: Simplify right side
    100,130.58x = 7,971,327,785.66
  5. Step 5: Solve for x
    x = 7,971,327,785.66/100,130.58
  6. Step 6: Final answer
    x = 79,609.32

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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.