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Finding the Fourth Proportional to 18,762.76, 28,153.50 and 7,677.64

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Solution

The fourth proportional to 18,762.76, 28,153.50 and 7,677.64 is: 11,520.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,762.76 : 28,153.50 = 7,677.64 : x
  2. Step 2: Convert to fraction form
    18,762.76/28,153.50 = 7,677.64/x
  3. Step 3: Cross multiply
    18,762.76x = 28,153.50 × 7,677.64
  4. Step 4: Simplify right side
    18,762.76x = 216,152,437.74
  5. Step 5: Solve for x
    x = 216,152,437.74/18,762.76
  6. Step 6: Final answer
    x = 11,520.29

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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.