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Finding the Fourth Proportional to 18,417.61, 25,450.71 and 15,690.71

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Solution

The fourth proportional to 18,417.61, 25,450.71 and 15,690.71 is: 21,682.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,417.61 : 25,450.71 = 15,690.71 : x
  2. Step 2: Convert to fraction form
    18,417.61/25,450.71 = 15,690.71/x
  3. Step 3: Cross multiply
    18,417.61x = 25,450.71 × 15,690.71
  4. Step 4: Simplify right side
    18,417.61x = 399,339,714.69
  5. Step 5: Solve for x
    x = 399,339,714.69/18,417.61
  6. Step 6: Final answer
    x = 21,682.49

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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.