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Finding the Fourth Proportional to 1,038.44, 1,557.05 and 421.83

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Solution

The fourth proportional to 1,038.44, 1,557.05 and 421.83 is: 632.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.44 : 1,557.05 = 421.83 : x
  2. Step 2: Convert to fraction form
    1,038.44/1,557.05 = 421.83/x
  3. Step 3: Cross multiply
    1,038.44x = 1,557.05 × 421.83
  4. Step 4: Simplify right side
    1,038.44x = 656,808.29
  5. Step 5: Solve for x
    x = 656,808.29/1,038.44
  6. Step 6: Final answer
    x = 632.49

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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.