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Finding the Fourth Proportional to 687.40, 962.36 and 687.40

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Solution

The fourth proportional to 687.40, 962.36 and 687.40 is: 962.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.40 : 962.36 = 687.40 : x
  2. Step 2: Convert to fraction form
    687.40/962.36 = 687.40/x
  3. Step 3: Cross multiply
    687.40x = 962.36 × 687.40
  4. Step 4: Simplify right side
    687.40x = 661,526.26
  5. Step 5: Solve for x
    x = 661,526.26/687.40
  6. Step 6: Final answer
    x = 962.36

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.