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Finding the Fourth Proportional to 15,518.53, 21,415.67 and 8,445

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Solution

The fourth proportional to 15,518.53, 21,415.67 and 8,445 is: 11,654.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,518.53 : 21,415.67 = 8,445 : x
  2. Step 2: Convert to fraction form
    15,518.53/21,415.67 = 8,445/x
  3. Step 3: Cross multiply
    15,518.53x = 21,415.67 × 8,445
  4. Step 4: Simplify right side
    15,518.53x = 180,855,333.15
  5. Step 5: Solve for x
    x = 180,855,333.15/15,518.53
  6. Step 6: Final answer
    x = 11,654.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.