Home / 13,781.58-19,017.18-7,813.78

Finding the Fourth Proportional to 13,781.58, 19,017.18 and 7,813.78

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Solution

The fourth proportional to 13,781.58, 19,017.18 and 7,813.78 is: 10,782.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.58 : 19,017.18 = 7,813.78 : x
  2. Step 2: Convert to fraction form
    13,781.58/19,017.18 = 7,813.78/x
  3. Step 3: Cross multiply
    13,781.58x = 19,017.18 × 7,813.78
  4. Step 4: Simplify right side
    13,781.58x = 148,596,060.74
  5. Step 5: Solve for x
    x = 148,596,060.74/13,781.58
  6. Step 6: Final answer
    x = 10,782.22

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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.