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Finding the Fourth Proportional to 40,389.84, 60,590.52 and 12,690

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Solution

The fourth proportional to 40,389.84, 60,590.52 and 12,690 is: 19,036.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,389.84 : 60,590.52 = 12,690 : x
  2. Step 2: Convert to fraction form
    40,389.84/60,590.52 = 12,690/x
  3. Step 3: Cross multiply
    40,389.84x = 60,590.52 × 12,690
  4. Step 4: Simplify right side
    40,389.84x = 768,893,698.80
  5. Step 5: Solve for x
    x = 768,893,698.80/40,389.84
  6. Step 6: Final answer
    x = 19,036.81

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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.