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Finding the Fourth Proportional to 20,710.60, 31,065.90 and 18,291.40

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Solution

The fourth proportional to 20,710.60, 31,065.90 and 18,291.40 is: 27,437.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,710.60 : 31,065.90 = 18,291.40 : x
  2. Step 2: Convert to fraction form
    20,710.60/31,065.90 = 18,291.40/x
  3. Step 3: Cross multiply
    20,710.60x = 31,065.90 × 18,291.40
  4. Step 4: Simplify right side
    20,710.60x = 568,238,803.26
  5. Step 5: Solve for x
    x = 568,238,803.26/20,710.60
  6. Step 6: Final answer
    x = 27,437.10

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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.