Home / 85,819.50-128,759.49-38,430.72

Finding the Fourth Proportional to 85,819.50, 128,759.49 and 38,430.72

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Solution

The fourth proportional to 85,819.50, 128,759.49 and 38,430.72 is: 57,659.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,819.50 : 128,759.49 = 38,430.72 : x
  2. Step 2: Convert to fraction form
    85,819.50/128,759.49 = 38,430.72/x
  3. Step 3: Cross multiply
    85,819.50x = 128,759.49 × 38,430.72
  4. Step 4: Simplify right side
    85,819.50x = 4,948,319,907.53
  5. Step 5: Solve for x
    x = 4,948,319,907.53/85,819.50
  6. Step 6: Final answer
    x = 57,659.62

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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.