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Finding the Fourth Proportional to 886.16, 1,330.16 and 643.77

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Solution

The fourth proportional to 886.16, 1,330.16 and 643.77 is: 966.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.16 : 1,330.16 = 643.77 : x
  2. Step 2: Convert to fraction form
    886.16/1,330.16 = 643.77/x
  3. Step 3: Cross multiply
    886.16x = 1,330.16 × 643.77
  4. Step 4: Simplify right side
    886.16x = 856,313.88
  5. Step 5: Solve for x
    x = 856,313.88/886.16
  6. Step 6: Final answer
    x = 966.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.