Home / 15,503.78-21,394.62-8,430.21

Finding the Fourth Proportional to 15,503.78, 21,394.62 and 8,430.21

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Solution

The fourth proportional to 15,503.78, 21,394.62 and 8,430.21 is: 11,633.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,503.78 : 21,394.62 = 8,430.21 : x
  2. Step 2: Convert to fraction form
    15,503.78/21,394.62 = 8,430.21/x
  3. Step 3: Cross multiply
    15,503.78x = 21,394.62 × 8,430.21
  4. Step 4: Simplify right side
    15,503.78x = 180,361,139.47
  5. Step 5: Solve for x
    x = 180,361,139.47/15,503.78
  6. Step 6: Final answer
    x = 11,633.37

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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.