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Finding the Fourth Proportional to 738.68, 1,018.86 and 640.26

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Solution

The fourth proportional to 738.68, 1,018.86 and 640.26 is: 883.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.68 : 1,018.86 = 640.26 : x
  2. Step 2: Convert to fraction form
    738.68/1,018.86 = 640.26/x
  3. Step 3: Cross multiply
    738.68x = 1,018.86 × 640.26
  4. Step 4: Simplify right side
    738.68x = 652,335.30
  5. Step 5: Solve for x
    x = 652,335.30/738.68
  6. Step 6: Final answer
    x = 883.11

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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.