Home / 1,021.10-1,409.11-555.35

Finding the Fourth Proportional to 1,021.10, 1,409.11 and 555.35

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Solution

The fourth proportional to 1,021.10, 1,409.11 and 555.35 is: 766.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.10 : 1,409.11 = 555.35 : x
  2. Step 2: Convert to fraction form
    1,021.10/1,409.11 = 555.35/x
  3. Step 3: Cross multiply
    1,021.10x = 1,409.11 × 555.35
  4. Step 4: Simplify right side
    1,021.10x = 782,544.33
  5. Step 5: Solve for x
    x = 782,544.33/1,021.10
  6. Step 6: Final answer
    x = 766.38

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Half scale
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Double scale
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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.