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Finding the Fourth Proportional to 889.10, 1,227.40 and 557.71

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Solution

The fourth proportional to 889.10, 1,227.40 and 557.71 is: 769.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.10 : 1,227.40 = 557.71 : x
  2. Step 2: Convert to fraction form
    889.10/1,227.40 = 557.71/x
  3. Step 3: Cross multiply
    889.10x = 1,227.40 × 557.71
  4. Step 4: Simplify right side
    889.10x = 684,528.79
  5. Step 5: Solve for x
    x = 684,528.79/889.10
  6. Step 6: Final answer
    x = 769.91

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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.