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Finding the Fourth Proportional to 30,661.38, 46,009.80 and 12,890.63

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Solution

The fourth proportional to 30,661.38, 46,009.80 and 12,890.63 is: 19,343.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,661.38 : 46,009.80 = 12,890.63 : x
  2. Step 2: Convert to fraction form
    30,661.38/46,009.80 = 12,890.63/x
  3. Step 3: Cross multiply
    30,661.38x = 46,009.80 × 12,890.63
  4. Step 4: Simplify right side
    30,661.38x = 593,095,423.20
  5. Step 5: Solve for x
    x = 593,095,423.20/30,661.38
  6. Step 6: Final answer
    x = 19,343.40

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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.