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Finding the Fourth Proportional to 714.36, 1,070.88 and 281.40

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Solution

The fourth proportional to 714.36, 1,070.88 and 281.40 is: 421.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.36 : 1,070.88 = 281.40 : x
  2. Step 2: Convert to fraction form
    714.36/1,070.88 = 281.40/x
  3. Step 3: Cross multiply
    714.36x = 1,070.88 × 281.40
  4. Step 4: Simplify right side
    714.36x = 301,345.63
  5. Step 5: Solve for x
    x = 301,345.63/714.36
  6. Step 6: Final answer
    x = 421.84

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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.