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Finding the Fourth Proportional to 1,087.60, 1,500.75 and 645.41

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Solution

The fourth proportional to 1,087.60, 1,500.75 and 645.41 is: 890.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.60 : 1,500.75 = 645.41 : x
  2. Step 2: Convert to fraction form
    1,087.60/1,500.75 = 645.41/x
  3. Step 3: Cross multiply
    1,087.60x = 1,500.75 × 645.41
  4. Step 4: Simplify right side
    1,087.60x = 968,599.06
  5. Step 5: Solve for x
    x = 968,599.06/1,087.60
  6. Step 6: Final answer
    x = 890.58

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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.