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Finding the Fourth Proportional to 1,240.76, 1,710.78 and 798.68

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Solution

The fourth proportional to 1,240.76, 1,710.78 and 798.68 is: 1,101.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.76 : 1,710.78 = 798.68 : x
  2. Step 2: Convert to fraction form
    1,240.76/1,710.78 = 798.68/x
  3. Step 3: Cross multiply
    1,240.76x = 1,710.78 × 798.68
  4. Step 4: Simplify right side
    1,240.76x = 1,366,365.77
  5. Step 5: Solve for x
    x = 1,366,365.77/1,240.76
  6. Step 6: Final answer
    x = 1,101.23

Related Problems

Find fourth proportional to 620.38, 855.39 and 399.34
Half scale
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Double scale
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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.