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Finding the Fourth Proportional to 1,289.98, 1,780.14 and 700.51

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Solution

The fourth proportional to 1,289.98, 1,780.14 and 700.51 is: 966.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.98 : 1,780.14 = 700.51 : x
  2. Step 2: Convert to fraction form
    1,289.98/1,780.14 = 700.51/x
  3. Step 3: Cross multiply
    1,289.98x = 1,780.14 × 700.51
  4. Step 4: Simplify right side
    1,289.98x = 1,246,996.97
  5. Step 5: Solve for x
    x = 1,246,996.97/1,289.98
  6. Step 6: Final answer
    x = 966.68

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1.5x scale

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.