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Finding the Fourth Proportional to 738.61, 1,019.27 and 407.05

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Solution

The fourth proportional to 738.61, 1,019.27 and 407.05 is: 561.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.61 : 1,019.27 = 407.05 : x
  2. Step 2: Convert to fraction form
    738.61/1,019.27 = 407.05/x
  3. Step 3: Cross multiply
    738.61x = 1,019.27 × 407.05
  4. Step 4: Simplify right side
    738.61x = 414,891.82
  5. Step 5: Solve for x
    x = 414,891.82/738.61
  6. Step 6: Final answer
    x = 561.72

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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.