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Finding the Fourth Proportional to 57,679.30, 86,518.95 and 20,281.60

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Solution

The fourth proportional to 57,679.30, 86,518.95 and 20,281.60 is: 30,422.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,679.30 : 86,518.95 = 20,281.60 : x
  2. Step 2: Convert to fraction form
    57,679.30/86,518.95 = 20,281.60/x
  3. Step 3: Cross multiply
    57,679.30x = 86,518.95 × 20,281.60
  4. Step 4: Simplify right side
    57,679.30x = 1,754,742,736.32
  5. Step 5: Solve for x
    x = 1,754,742,736.32/57,679.30
  6. Step 6: Final answer
    x = 30,422.40

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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.