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Finding the Fourth Proportional to 18,312.30, 27,468.45 and 12,407.40

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Solution

The fourth proportional to 18,312.30, 27,468.45 and 12,407.40 is: 18,611.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,312.30 : 27,468.45 = 12,407.40 : x
  2. Step 2: Convert to fraction form
    18,312.30/27,468.45 = 12,407.40/x
  3. Step 3: Cross multiply
    18,312.30x = 27,468.45 × 12,407.40
  4. Step 4: Simplify right side
    18,312.30x = 340,812,046.53
  5. Step 5: Solve for x
    x = 340,812,046.53/18,312.30
  6. Step 6: Final answer
    x = 18,611.10

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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.