Home / 85,739.95-128,653.85-40,812.15

Finding the Fourth Proportional to 85,739.95, 128,653.85 and 40,812.15

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Solution

The fourth proportional to 85,739.95, 128,653.85 and 40,812.15 is: 61,239.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,739.95 : 128,653.85 = 40,812.15 : x
  2. Step 2: Convert to fraction form
    85,739.95/128,653.85 = 40,812.15/x
  3. Step 3: Cross multiply
    85,739.95x = 128,653.85 × 40,812.15
  4. Step 4: Simplify right side
    85,739.95x = 5,250,640,808.76
  5. Step 5: Solve for x
    x = 5,250,640,808.76/85,739.95
  6. Step 6: Final answer
    x = 61,239.14

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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.