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Finding the Fourth Proportional to 1,045.42, 1,568.55 and 429.43

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Solution

The fourth proportional to 1,045.42, 1,568.55 and 429.43 is: 644.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.42 : 1,568.55 = 429.43 : x
  2. Step 2: Convert to fraction form
    1,045.42/1,568.55 = 429.43/x
  3. Step 3: Cross multiply
    1,045.42x = 1,568.55 × 429.43
  4. Step 4: Simplify right side
    1,045.42x = 673,582.43
  5. Step 5: Solve for x
    x = 673,582.43/1,045.42
  6. Step 6: Final answer
    x = 644.32

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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.