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Finding the Fourth Proportional to 1,048.62, 1,572.84 and 431.94

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Solution

The fourth proportional to 1,048.62, 1,572.84 and 431.94 is: 647.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.62 : 1,572.84 = 431.94 : x
  2. Step 2: Convert to fraction form
    1,048.62/1,572.84 = 431.94/x
  3. Step 3: Cross multiply
    1,048.62x = 1,572.84 × 431.94
  4. Step 4: Simplify right side
    1,048.62x = 679,372.51
  5. Step 5: Solve for x
    x = 679,372.51/1,048.62
  6. Step 6: Final answer
    x = 647.87

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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.