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Finding the Fourth Proportional to 1,240.74, 1,712.09 and 709.58

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Solution

The fourth proportional to 1,240.74, 1,712.09 and 709.58 is: 979.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.74 : 1,712.09 = 709.58 : x
  2. Step 2: Convert to fraction form
    1,240.74/1,712.09 = 709.58/x
  3. Step 3: Cross multiply
    1,240.74x = 1,712.09 × 709.58
  4. Step 4: Simplify right side
    1,240.74x = 1,214,852.71
  5. Step 5: Solve for x
    x = 1,214,852.71/1,240.74
  6. Step 6: Final answer
    x = 979.14

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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.