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Finding the Fourth Proportional to 28,491.64, 42,765 and 13,710.76

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Solution

The fourth proportional to 28,491.64, 42,765 and 13,710.76 is: 20,579.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,491.64 : 42,765 = 13,710.76 : x
  2. Step 2: Convert to fraction form
    28,491.64/42,765 = 13,710.76/x
  3. Step 3: Cross multiply
    28,491.64x = 42,765 × 13,710.76
  4. Step 4: Simplify right side
    28,491.64x = 586,340,651.40
  5. Step 5: Solve for x
    x = 586,340,651.40/28,491.64
  6. Step 6: Final answer
    x = 20,579.39

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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.