Home / 85,641.12-128,416.32-30,198.24

Finding the Fourth Proportional to 85,641.12, 128,416.32 and 30,198.24

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Solution

The fourth proportional to 85,641.12, 128,416.32 and 30,198.24 is: 45,281.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,641.12 : 128,416.32 = 30,198.24 : x
  2. Step 2: Convert to fraction form
    85,641.12/128,416.32 = 30,198.24/x
  3. Step 3: Cross multiply
    85,641.12x = 128,416.32 × 30,198.24
  4. Step 4: Simplify right side
    85,641.12x = 3,877,946,851.28
  5. Step 5: Solve for x
    x = 3,877,946,851.28/85,641.12
  6. Step 6: Final answer
    x = 45,281.37

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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.