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Finding the Fourth Proportional to 826.50, 1,140.58 and 477.40

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Solution

The fourth proportional to 826.50, 1,140.58 and 477.40 is: 658.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.50 : 1,140.58 = 477.40 : x
  2. Step 2: Convert to fraction form
    826.50/1,140.58 = 477.40/x
  3. Step 3: Cross multiply
    826.50x = 1,140.58 × 477.40
  4. Step 4: Simplify right side
    826.50x = 544,512.89
  5. Step 5: Solve for x
    x = 544,512.89/826.50
  6. Step 6: Final answer
    x = 658.82

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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.