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Finding the Fourth Proportional to 826.40, 1,140.46 and 472.38

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Solution

The fourth proportional to 826.40, 1,140.46 and 472.38 is: 651.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.40 : 1,140.46 = 472.38 : x
  2. Step 2: Convert to fraction form
    826.40/1,140.46 = 472.38/x
  3. Step 3: Cross multiply
    826.40x = 1,140.46 × 472.38
  4. Step 4: Simplify right side
    826.40x = 538,730.49
  5. Step 5: Solve for x
    x = 538,730.49/826.40
  6. Step 6: Final answer
    x = 651.90

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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.