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Finding the Fourth Proportional to 1,111.51, 1,533.90 and 645.76

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Solution

The fourth proportional to 1,111.51, 1,533.90 and 645.76 is: 891.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.51 : 1,533.90 = 645.76 : x
  2. Step 2: Convert to fraction form
    1,111.51/1,533.90 = 645.76/x
  3. Step 3: Cross multiply
    1,111.51x = 1,533.90 × 645.76
  4. Step 4: Simplify right side
    1,111.51x = 990,531.26
  5. Step 5: Solve for x
    x = 990,531.26/1,111.51
  6. Step 6: Final answer
    x = 891.16

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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.