Home / 85,504.24-128,840-70,263.28

Finding the Fourth Proportional to 85,504.24, 128,840 and 70,263.28

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Solution

The fourth proportional to 85,504.24, 128,840 and 70,263.28 is: 105,874.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,504.24 : 128,840 = 70,263.28 : x
  2. Step 2: Convert to fraction form
    85,504.24/128,840 = 70,263.28/x
  3. Step 3: Cross multiply
    85,504.24x = 128,840 × 70,263.28
  4. Step 4: Simplify right side
    85,504.24x = 9,052,720,995.20
  5. Step 5: Solve for x
    x = 9,052,720,995.20/85,504.24
  6. Step 6: Final answer
    x = 105,874.53

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.