Home / 1,645.08-2,270.08-981.78

Finding the Fourth Proportional to 1,645.08, 2,270.08 and 981.78

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Solution

The fourth proportional to 1,645.08, 2,270.08 and 981.78 is: 1,354.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.08 : 2,270.08 = 981.78 : x
  2. Step 2: Convert to fraction form
    1,645.08/2,270.08 = 981.78/x
  3. Step 3: Cross multiply
    1,645.08x = 2,270.08 × 981.78
  4. Step 4: Simplify right side
    1,645.08x = 2,228,719.14
  5. Step 5: Solve for x
    x = 2,228,719.14/1,645.08
  6. Step 6: Final answer
    x = 1,354.78

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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.