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Finding the Fourth Proportional to 457.05, 686.40 and 400.35

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Solution

The fourth proportional to 457.05, 686.40 and 400.35 is: 601.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.05 : 686.40 = 400.35 : x
  2. Step 2: Convert to fraction form
    457.05/686.40 = 400.35/x
  3. Step 3: Cross multiply
    457.05x = 686.40 × 400.35
  4. Step 4: Simplify right side
    457.05x = 274,800.24
  5. Step 5: Solve for x
    x = 274,800.24/457.05
  6. Step 6: Final answer
    x = 601.25

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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.