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Finding the Fourth Proportional to 714.64, 1,070.40 and 425.44

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Solution

The fourth proportional to 714.64, 1,070.40 and 425.44 is: 637.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.64 : 1,070.40 = 425.44 : x
  2. Step 2: Convert to fraction form
    714.64/1,070.40 = 425.44/x
  3. Step 3: Cross multiply
    714.64x = 1,070.40 × 425.44
  4. Step 4: Simplify right side
    714.64x = 455,390.98
  5. Step 5: Solve for x
    x = 455,390.98/714.64
  6. Step 6: Final answer
    x = 637.23

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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.