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Finding the Fourth Proportional to 18,386.70, 27,588.15 and 8,520.90

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Solution

The fourth proportional to 18,386.70, 27,588.15 and 8,520.90 is: 12,785.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,386.70 : 27,588.15 = 8,520.90 : x
  2. Step 2: Convert to fraction form
    18,386.70/27,588.15 = 8,520.90/x
  3. Step 3: Cross multiply
    18,386.70x = 27,588.15 × 8,520.90
  4. Step 4: Simplify right side
    18,386.70x = 235,075,867.34
  5. Step 5: Solve for x
    x = 235,075,867.34/18,386.70
  6. Step 6: Final answer
    x = 12,785.10

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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.