Home / 85,612.13-128,418.60-30,208.13

Finding the Fourth Proportional to 85,612.13, 128,418.60 and 30,208.13

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Solution

The fourth proportional to 85,612.13, 128,418.60 and 30,208.13 is: 45,312.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,612.13 : 128,418.60 = 30,208.13 : x
  2. Step 2: Convert to fraction form
    85,612.13/128,418.60 = 30,208.13/x
  3. Step 3: Cross multiply
    85,612.13x = 128,418.60 × 30,208.13
  4. Step 4: Simplify right side
    85,612.13x = 3,879,285,763.22
  5. Step 5: Solve for x
    x = 3,879,285,763.22/85,612.13
  6. Step 6: Final answer
    x = 45,312.34

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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.