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Finding the Fourth Proportional to 1,087.58, 1,500.37 and 645.23

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Solution

The fourth proportional to 1,087.58, 1,500.37 and 645.23 is: 890.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.58 : 1,500.37 = 645.23 : x
  2. Step 2: Convert to fraction form
    1,087.58/1,500.37 = 645.23/x
  3. Step 3: Cross multiply
    1,087.58x = 1,500.37 × 645.23
  4. Step 4: Simplify right side
    1,087.58x = 968,085.87
  5. Step 5: Solve for x
    x = 968,085.87/1,087.58
  6. Step 6: Final answer
    x = 890.13

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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.