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Finding the Fourth Proportional to 15,390.63, 21,239 and 8,317.04

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Solution

The fourth proportional to 15,390.63, 21,239 and 8,317.04 is: 11,477.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,390.63 : 21,239 = 8,317.04 : x
  2. Step 2: Convert to fraction form
    15,390.63/21,239 = 8,317.04/x
  3. Step 3: Cross multiply
    15,390.63x = 21,239 × 8,317.04
  4. Step 4: Simplify right side
    15,390.63x = 176,645,506.37
  5. Step 5: Solve for x
    x = 176,645,506.37/15,390.63
  6. Step 6: Final answer
    x = 11,477.47

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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.