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Finding the Fourth Proportional to 12,587.40, 18,902.70 and 8,915.40

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Solution

The fourth proportional to 12,587.40, 18,902.70 and 8,915.40 is: 13,388.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,587.40 : 18,902.70 = 8,915.40 : x
  2. Step 2: Convert to fraction form
    12,587.40/18,902.70 = 8,915.40/x
  3. Step 3: Cross multiply
    12,587.40x = 18,902.70 × 8,915.40
  4. Step 4: Simplify right side
    12,587.40x = 168,525,131.58
  5. Step 5: Solve for x
    x = 168,525,131.58/12,587.40
  6. Step 6: Final answer
    x = 13,388.40

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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.