Home / 85,869.51-128,638.20-48,315.48

Finding the Fourth Proportional to 85,869.51, 128,638.20 and 48,315.48

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Solution

The fourth proportional to 85,869.51, 128,638.20 and 48,315.48 is: 72,379.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,869.51 : 128,638.20 = 48,315.48 : x
  2. Step 2: Convert to fraction form
    85,869.51/128,638.20 = 48,315.48/x
  3. Step 3: Cross multiply
    85,869.51x = 128,638.20 × 48,315.48
  4. Step 4: Simplify right side
    85,869.51x = 6,215,216,379.34
  5. Step 5: Solve for x
    x = 6,215,216,379.34/85,869.51
  6. Step 6: Final answer
    x = 72,379.78

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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.