Home / 85,712.23-128,568.35-38,978.47

Finding the Fourth Proportional to 85,712.23, 128,568.35 and 38,978.47

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Solution

The fourth proportional to 85,712.23, 128,568.35 and 38,978.47 is: 58,467.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,712.23 : 128,568.35 = 38,978.47 : x
  2. Step 2: Convert to fraction form
    85,712.23/128,568.35 = 38,978.47/x
  3. Step 3: Cross multiply
    85,712.23x = 128,568.35 × 38,978.47
  4. Step 4: Simplify right side
    85,712.23x = 5,011,397,573.42
  5. Step 5: Solve for x
    x = 5,011,397,573.42/85,712.23
  6. Step 6: Final answer
    x = 58,467.71

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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.