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Finding the Fourth Proportional to 738.54, 1,018.64 and 645.10

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Solution

The fourth proportional to 738.54, 1,018.64 and 645.10 is: 889.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.54 : 1,018.64 = 645.10 : x
  2. Step 2: Convert to fraction form
    738.54/1,018.64 = 645.10/x
  3. Step 3: Cross multiply
    738.54x = 1,018.64 × 645.10
  4. Step 4: Simplify right side
    738.54x = 657,123.73
  5. Step 5: Solve for x
    x = 657,123.73/738.54
  6. Step 6: Final answer
    x = 889.76

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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.