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Finding the Fourth Proportional to 30,644.60, 42,299.70 and 19,315.40

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Solution

The fourth proportional to 30,644.60, 42,299.70 and 19,315.40 is: 26,661.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,644.60 : 42,299.70 = 19,315.40 : x
  2. Step 2: Convert to fraction form
    30,644.60/42,299.70 = 19,315.40/x
  3. Step 3: Cross multiply
    30,644.60x = 42,299.70 × 19,315.40
  4. Step 4: Simplify right side
    30,644.60x = 817,035,625.38
  5. Step 5: Solve for x
    x = 817,035,625.38/30,644.60
  6. Step 6: Final answer
    x = 26,661.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.