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Finding the Fourth Proportional to 1,256.77, 1,734.29 and 697.25

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Solution

The fourth proportional to 1,256.77, 1,734.29 and 697.25 is: 962.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.77 : 1,734.29 = 697.25 : x
  2. Step 2: Convert to fraction form
    1,256.77/1,734.29 = 697.25/x
  3. Step 3: Cross multiply
    1,256.77x = 1,734.29 × 697.25
  4. Step 4: Simplify right side
    1,256.77x = 1,209,221.54
  5. Step 5: Solve for x
    x = 1,209,221.54/1,256.77
  6. Step 6: Final answer
    x = 962.17

Related Problems

Find fourth proportional to 628.38, 867.14 and 348.62
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.