Home / 12,981.40-17,911.08-7,315

Finding the Fourth Proportional to 12,981.40, 17,911.08 and 7,315

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Solution

The fourth proportional to 12,981.40, 17,911.08 and 7,315 is: 10,092.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,981.40 : 17,911.08 = 7,315 : x
  2. Step 2: Convert to fraction form
    12,981.40/17,911.08 = 7,315/x
  3. Step 3: Cross multiply
    12,981.40x = 17,911.08 × 7,315
  4. Step 4: Simplify right side
    12,981.40x = 131,019,550.20
  5. Step 5: Solve for x
    x = 131,019,550.20/12,981.40
  6. Step 6: Final answer
    x = 10,092.87

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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.