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Finding the Fourth Proportional to 12,868.08, 17,765.96 and 9,878.20

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Solution

The fourth proportional to 12,868.08, 17,765.96 and 9,878.20 is: 13,638.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,868.08 : 17,765.96 = 9,878.20 : x
  2. Step 2: Convert to fraction form
    12,868.08/17,765.96 = 9,878.20/x
  3. Step 3: Cross multiply
    12,868.08x = 17,765.96 × 9,878.20
  4. Step 4: Simplify right side
    12,868.08x = 175,495,706.07
  5. Step 5: Solve for x
    x = 175,495,706.07/12,868.08
  6. Step 6: Final answer
    x = 13,638.06

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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.