Home / 85,712.30-128,568.45-30,308.30

Finding the Fourth Proportional to 85,712.30, 128,568.45 and 30,308.30

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Solution

The fourth proportional to 85,712.30, 128,568.45 and 30,308.30 is: 45,462.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,712.30 : 128,568.45 = 30,308.30 : x
  2. Step 2: Convert to fraction form
    85,712.30/128,568.45 = 30,308.30/x
  3. Step 3: Cross multiply
    85,712.30x = 128,568.45 × 30,308.30
  4. Step 4: Simplify right side
    85,712.30x = 3,896,691,153.14
  5. Step 5: Solve for x
    x = 3,896,691,153.14/85,712.30
  6. Step 6: Final answer
    x = 45,462.45

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Double scale
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Similar ratio
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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.