Home / 13,290.28-19,935.45-12,478.36

Finding the Fourth Proportional to 13,290.28, 19,935.45 and 12,478.36

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Solution

The fourth proportional to 13,290.28, 19,935.45 and 12,478.36 is: 18,717.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,290.28 : 19,935.45 = 12,478.36 : x
  2. Step 2: Convert to fraction form
    13,290.28/19,935.45 = 12,478.36/x
  3. Step 3: Cross multiply
    13,290.28x = 19,935.45 × 12,478.36
  4. Step 4: Simplify right side
    13,290.28x = 248,761,721.86
  5. Step 5: Solve for x
    x = 248,761,721.86/13,290.28
  6. Step 6: Final answer
    x = 18,717.57

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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.