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Finding the Fourth Proportional to 1,124.15, 1,686.36 and 421.58

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Solution

The fourth proportional to 1,124.15, 1,686.36 and 421.58 is: 632.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.15 : 1,686.36 = 421.58 : x
  2. Step 2: Convert to fraction form
    1,124.15/1,686.36 = 421.58/x
  3. Step 3: Cross multiply
    1,124.15x = 1,686.36 × 421.58
  4. Step 4: Simplify right side
    1,124.15x = 710,941.45
  5. Step 5: Solve for x
    x = 710,941.45/1,124.15
  6. Step 6: Final answer
    x = 632.43

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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.