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Finding the Fourth Proportional to 15,153.18, 20,918.14 and 9,415.89

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Solution

The fourth proportional to 15,153.18, 20,918.14 and 9,415.89 is: 12,998.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,153.18 : 20,918.14 = 9,415.89 : x
  2. Step 2: Convert to fraction form
    15,153.18/20,918.14 = 9,415.89/x
  3. Step 3: Cross multiply
    15,153.18x = 20,918.14 × 9,415.89
  4. Step 4: Simplify right side
    15,153.18x = 196,962,913.34
  5. Step 5: Solve for x
    x = 196,962,913.34/15,153.18
  6. Step 6: Final answer
    x = 12,998.13

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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.