Home / 12,948.79-19,430.88-12,128.80

Finding the Fourth Proportional to 12,948.79, 19,430.88 and 12,128.80

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Solution

The fourth proportional to 12,948.79, 19,430.88 and 12,128.80 is: 18,200.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,948.79 : 19,430.88 = 12,128.80 : x
  2. Step 2: Convert to fraction form
    12,948.79/19,430.88 = 12,128.80/x
  3. Step 3: Cross multiply
    12,948.79x = 19,430.88 × 12,128.80
  4. Step 4: Simplify right side
    12,948.79x = 235,673,257.34
  5. Step 5: Solve for x
    x = 235,673,257.34/12,948.79
  6. Step 6: Final answer
    x = 18,200.41

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1.5x scale

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.