Home / 65,857.12-90,912-42,015.04

Finding the Fourth Proportional to 65,857.12, 90,912 and 42,015.04

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Solution

The fourth proportional to 65,857.12, 90,912 and 42,015.04 is: 57,999.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,857.12 : 90,912 = 42,015.04 : x
  2. Step 2: Convert to fraction form
    65,857.12/90,912 = 42,015.04/x
  3. Step 3: Cross multiply
    65,857.12x = 90,912 × 42,015.04
  4. Step 4: Simplify right side
    65,857.12x = 3,819,671,316.48
  5. Step 5: Solve for x
    x = 3,819,671,316.48/65,857.12
  6. Step 6: Final answer
    x = 57,999.37

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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.