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Finding the Fourth Proportional to 914.88, 1,261.58 and 691.34

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Solution

The fourth proportional to 914.88, 1,261.58 and 691.34 is: 953.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.88 : 1,261.58 = 691.34 : x
  2. Step 2: Convert to fraction form
    914.88/1,261.58 = 691.34/x
  3. Step 3: Cross multiply
    914.88x = 1,261.58 × 691.34
  4. Step 4: Simplify right side
    914.88x = 872,177.26
  5. Step 5: Solve for x
    x = 872,177.26/914.88
  6. Step 6: Final answer
    x = 953.32

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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.