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Finding the Fourth Proportional to 520.20, 718.45 and 403.58

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Solution

The fourth proportional to 520.20, 718.45 and 403.58 is: 557.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.20 : 718.45 = 403.58 : x
  2. Step 2: Convert to fraction form
    520.20/718.45 = 403.58/x
  3. Step 3: Cross multiply
    520.20x = 718.45 × 403.58
  4. Step 4: Simplify right side
    520.20x = 289,950.37
  5. Step 5: Solve for x
    x = 289,950.37/520.20
  6. Step 6: Final answer
    x = 557.39

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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.