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Finding the Fourth Proportional to 12,888.76, 19,316 and 8,440.80

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Solution

The fourth proportional to 12,888.76, 19,316 and 8,440.80 is: 12,649.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,888.76 : 19,316 = 8,440.80 : x
  2. Step 2: Convert to fraction form
    12,888.76/19,316 = 8,440.80/x
  3. Step 3: Cross multiply
    12,888.76x = 19,316 × 8,440.80
  4. Step 4: Simplify right side
    12,888.76x = 163,042,492.80
  5. Step 5: Solve for x
    x = 163,042,492.80/12,888.76
  6. Step 6: Final answer
    x = 12,649.98

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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.