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Finding the Fourth Proportional to 889.79, 1,227.85 and 491.42

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Solution

The fourth proportional to 889.79, 1,227.85 and 491.42 is: 678.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.79 : 1,227.85 = 491.42 : x
  2. Step 2: Convert to fraction form
    889.79/1,227.85 = 491.42/x
  3. Step 3: Cross multiply
    889.79x = 1,227.85 × 491.42
  4. Step 4: Simplify right side
    889.79x = 603,391.89
  5. Step 5: Solve for x
    x = 603,391.89/889.79
  6. Step 6: Final answer
    x = 678.13

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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.