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Finding the Fourth Proportional to 738.40, 1,018.99 and 406.82

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Solution

The fourth proportional to 738.40, 1,018.99 and 406.82 is: 561.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.40 : 1,018.99 = 406.82 : x
  2. Step 2: Convert to fraction form
    738.40/1,018.99 = 406.82/x
  3. Step 3: Cross multiply
    738.40x = 1,018.99 × 406.82
  4. Step 4: Simplify right side
    738.40x = 414,545.51
  5. Step 5: Solve for x
    x = 414,545.51/738.40
  6. Step 6: Final answer
    x = 561.41

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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.