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Finding the Fourth Proportional to 926.77, 1,390.45 and 407.21

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Solution

The fourth proportional to 926.77, 1,390.45 and 407.21 is: 610.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.77 : 1,390.45 = 407.21 : x
  2. Step 2: Convert to fraction form
    926.77/1,390.45 = 407.21/x
  3. Step 3: Cross multiply
    926.77x = 1,390.45 × 407.21
  4. Step 4: Simplify right side
    926.77x = 566,200.55
  5. Step 5: Solve for x
    x = 566,200.55/926.77
  6. Step 6: Final answer
    x = 610.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.