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Finding the Fourth Proportional to 404.43, 560.73 and 390.93

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Solution

The fourth proportional to 404.43, 560.73 and 390.93 is: 542.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.43 : 560.73 = 390.93 : x
  2. Step 2: Convert to fraction form
    404.43/560.73 = 390.93/x
  3. Step 3: Cross multiply
    404.43x = 560.73 × 390.93
  4. Step 4: Simplify right side
    404.43x = 219,206.18
  5. Step 5: Solve for x
    x = 219,206.18/404.43
  6. Step 6: Final answer
    x = 542.01

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.