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Finding the Fourth Proportional to 738.39, 1,018.92 and 406.77

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Solution

The fourth proportional to 738.39, 1,018.92 and 406.77 is: 561.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.39 : 1,018.92 = 406.77 : x
  2. Step 2: Convert to fraction form
    738.39/1,018.92 = 406.77/x
  3. Step 3: Cross multiply
    738.39x = 1,018.92 × 406.77
  4. Step 4: Simplify right side
    738.39x = 414,460.74
  5. Step 5: Solve for x
    x = 414,460.74/738.39
  6. Step 6: Final answer
    x = 561.31

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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.