Home / 1,111.14-1,533.32-638.70

Finding the Fourth Proportional to 1,111.14, 1,533.32 and 638.70

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Solution

The fourth proportional to 1,111.14, 1,533.32 and 638.70 is: 881.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.14 : 1,533.32 = 638.70 : x
  2. Step 2: Convert to fraction form
    1,111.14/1,533.32 = 638.70/x
  3. Step 3: Cross multiply
    1,111.14x = 1,533.32 × 638.70
  4. Step 4: Simplify right side
    1,111.14x = 979,331.48
  5. Step 5: Solve for x
    x = 979,331.48/1,111.14
  6. Step 6: Final answer
    x = 881.38

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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.