Home / 1,988.17-2,981.37-817.21

Finding the Fourth Proportional to 1,988.17, 2,981.37 and 817.21

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Solution

The fourth proportional to 1,988.17, 2,981.37 and 817.21 is: 1,225.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.17 : 2,981.37 = 817.21 : x
  2. Step 2: Convert to fraction form
    1,988.17/2,981.37 = 817.21/x
  3. Step 3: Cross multiply
    1,988.17x = 2,981.37 × 817.21
  4. Step 4: Simplify right side
    1,988.17x = 2,436,405.38
  5. Step 5: Solve for x
    x = 2,436,405.38/1,988.17
  6. Step 6: Final answer
    x = 1,225.45

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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.