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Finding the Fourth Proportional to 881.33, 1,215.77 and 715.25

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Solution

The fourth proportional to 881.33, 1,215.77 and 715.25 is: 986.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.33 : 1,215.77 = 715.25 : x
  2. Step 2: Convert to fraction form
    881.33/1,215.77 = 715.25/x
  3. Step 3: Cross multiply
    881.33x = 1,215.77 × 715.25
  4. Step 4: Simplify right side
    881.33x = 869,581.64
  5. Step 5: Solve for x
    x = 869,581.64/881.33
  6. Step 6: Final answer
    x = 986.67

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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.