Home / 78,121.55-107,808.01-42,311.45

Finding the Fourth Proportional to 78,121.55, 107,808.01 and 42,311.45

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Solution

The fourth proportional to 78,121.55, 107,808.01 and 42,311.45 is: 58,389.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,121.55 : 107,808.01 = 42,311.45 : x
  2. Step 2: Convert to fraction form
    78,121.55/107,808.01 = 42,311.45/x
  3. Step 3: Cross multiply
    78,121.55x = 107,808.01 × 42,311.45
  4. Step 4: Simplify right side
    78,121.55x = 4,561,512,579.90
  5. Step 5: Solve for x
    x = 4,561,512,579.90/78,121.55
  6. Step 6: Final answer
    x = 58,389.94

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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.