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Finding the Fourth Proportional to 14,290.80, 19,720.32 and 7,916.94

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Solution

The fourth proportional to 14,290.80, 19,720.32 and 7,916.94 is: 10,924.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,290.80 : 19,720.32 = 7,916.94 : x
  2. Step 2: Convert to fraction form
    14,290.80/19,720.32 = 7,916.94/x
  3. Step 3: Cross multiply
    14,290.80x = 19,720.32 × 7,916.94
  4. Step 4: Simplify right side
    14,290.80x = 156,124,590.22
  5. Step 5: Solve for x
    x = 156,124,590.22/14,290.80
  6. Step 6: Final answer
    x = 10,924.83

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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.