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Finding the Fourth Proportional to 12,358.70, 18,538.05 and 3,124.70

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Solution

The fourth proportional to 12,358.70, 18,538.05 and 3,124.70 is: 4,687.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,358.70 : 18,538.05 = 3,124.70 : x
  2. Step 2: Convert to fraction form
    12,358.70/18,538.05 = 3,124.70/x
  3. Step 3: Cross multiply
    12,358.70x = 18,538.05 × 3,124.70
  4. Step 4: Simplify right side
    12,358.70x = 57,925,844.84
  5. Step 5: Solve for x
    x = 57,925,844.84/12,358.70
  6. Step 6: Final answer
    x = 4,687.05

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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.