Home / 387,240.77-534,450-305,381.36

Finding the Fourth Proportional to 387,240.77, 534,450 and 305,381.36

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Solution

The fourth proportional to 387,240.77, 534,450 and 305,381.36 is: 421,471.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,240.77 : 534,450 = 305,381.36 : x
  2. Step 2: Convert to fraction form
    387,240.77/534,450 = 305,381.36/x
  3. Step 3: Cross multiply
    387,240.77x = 534,450 × 305,381.36
  4. Step 4: Simplify right side
    387,240.77x = 163,211,065,179.75
  5. Step 5: Solve for x
    x = 163,211,065,179.75/387,240.77
  6. Step 6: Final answer
    x = 421,471.81

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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.