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Finding the Fourth Proportional to 12,615.40, 18,929.10 and 8,457.40

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Solution

The fourth proportional to 12,615.40, 18,929.10 and 8,457.40 is: 12,690.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,615.40 : 18,929.10 = 8,457.40 : x
  2. Step 2: Convert to fraction form
    12,615.40/18,929.10 = 8,457.40/x
  3. Step 3: Cross multiply
    12,615.40x = 18,929.10 × 8,457.40
  4. Step 4: Simplify right side
    12,615.40x = 160,090,970.34
  5. Step 5: Solve for x
    x = 160,090,970.34/12,615.40
  6. Step 6: Final answer
    x = 12,690.12

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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.