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Finding the Fourth Proportional to 738.13, 1,018.63 and 406.55

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Solution

The fourth proportional to 738.13, 1,018.63 and 406.55 is: 561.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.13 : 1,018.63 = 406.55 : x
  2. Step 2: Convert to fraction form
    738.13/1,018.63 = 406.55/x
  3. Step 3: Cross multiply
    738.13x = 1,018.63 × 406.55
  4. Step 4: Simplify right side
    738.13x = 414,127.08
  5. Step 5: Solve for x
    x = 414,127.08/738.13
  6. Step 6: Final answer
    x = 561.05

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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.