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Finding the Fourth Proportional to 1,038.26, 1,557.36 and 421.79

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Solution

The fourth proportional to 1,038.26, 1,557.36 and 421.79 is: 632.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.26 : 1,557.36 = 421.79 : x
  2. Step 2: Convert to fraction form
    1,038.26/1,557.36 = 421.79/x
  3. Step 3: Cross multiply
    1,038.26x = 1,557.36 × 421.79
  4. Step 4: Simplify right side
    1,038.26x = 656,871.09
  5. Step 5: Solve for x
    x = 656,871.09/1,038.26
  6. Step 6: Final answer
    x = 632.66

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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.