Home / 85,723.98-128,586-38,990.22

Finding the Fourth Proportional to 85,723.98, 128,586 and 38,990.22

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Solution

The fourth proportional to 85,723.98, 128,586 and 38,990.22 is: 58,485.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,723.98 : 128,586 = 38,990.22 : x
  2. Step 2: Convert to fraction form
    85,723.98/128,586 = 38,990.22/x
  3. Step 3: Cross multiply
    85,723.98x = 128,586 × 38,990.22
  4. Step 4: Simplify right side
    85,723.98x = 5,013,596,428.92
  5. Step 5: Solve for x
    x = 5,013,596,428.92/85,723.98
  6. Step 6: Final answer
    x = 58,485.34

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1.5x scale

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.