Home / 85,820.50-128,760.99-38,431.72

Finding the Fourth Proportional to 85,820.50, 128,760.99 and 38,431.72

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Solution

The fourth proportional to 85,820.50, 128,760.99 and 38,431.72 is: 57,661.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,820.50 : 128,760.99 = 38,431.72 : x
  2. Step 2: Convert to fraction form
    85,820.50/128,760.99 = 38,431.72/x
  3. Step 3: Cross multiply
    85,820.50x = 128,760.99 × 38,431.72
  4. Step 4: Simplify right side
    85,820.50x = 4,948,506,314.60
  5. Step 5: Solve for x
    x = 4,948,506,314.60/85,820.50
  6. Step 6: Final answer
    x = 57,661.12

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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.