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Finding the Fourth Proportional to 19,316.40, 28,985.40 and 8,221.20

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Solution

The fourth proportional to 19,316.40, 28,985.40 and 8,221.20 is: 12,336.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,316.40 : 28,985.40 = 8,221.20 : x
  2. Step 2: Convert to fraction form
    19,316.40/28,985.40 = 8,221.20/x
  3. Step 3: Cross multiply
    19,316.40x = 28,985.40 × 8,221.20
  4. Step 4: Simplify right side
    19,316.40x = 238,294,770.48
  5. Step 5: Solve for x
    x = 238,294,770.48/19,316.40
  6. Step 6: Final answer
    x = 12,336.40

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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.