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Finding the Fourth Proportional to 1,281.60, 1,768.63 and 714.47

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Solution

The fourth proportional to 1,281.60, 1,768.63 and 714.47 is: 985.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.60 : 1,768.63 = 714.47 : x
  2. Step 2: Convert to fraction form
    1,281.60/1,768.63 = 714.47/x
  3. Step 3: Cross multiply
    1,281.60x = 1,768.63 × 714.47
  4. Step 4: Simplify right side
    1,281.60x = 1,263,633.10
  5. Step 5: Solve for x
    x = 1,263,633.10/1,281.60
  6. Step 6: Final answer
    x = 985.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.