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Finding the Fourth Proportional to 1,038.17, 1,557.27 and 421.76

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Solution

The fourth proportional to 1,038.17, 1,557.27 and 421.76 is: 632.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.17 : 1,557.27 = 421.76 : x
  2. Step 2: Convert to fraction form
    1,038.17/1,557.27 = 421.76/x
  3. Step 3: Cross multiply
    1,038.17x = 1,557.27 × 421.76
  4. Step 4: Simplify right side
    1,038.17x = 656,786.41
  5. Step 5: Solve for x
    x = 656,786.41/1,038.17
  6. Step 6: Final answer
    x = 632.64

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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.