Home / 78,123.54-107,809.20-42,313.26

Finding the Fourth Proportional to 78,123.54, 107,809.20 and 42,313.26

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Solution

The fourth proportional to 78,123.54, 107,809.20 and 42,313.26 is: 58,391.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,123.54 : 107,809.20 = 42,313.26 : x
  2. Step 2: Convert to fraction form
    78,123.54/107,809.20 = 42,313.26/x
  3. Step 3: Cross multiply
    78,123.54x = 107,809.20 × 42,313.26
  4. Step 4: Simplify right side
    78,123.54x = 4,561,758,709.99
  5. Step 5: Solve for x
    x = 4,561,758,709.99/78,123.54
  6. Step 6: Final answer
    x = 58,391.60

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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.