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Finding the Fourth Proportional to 691.54, 954.18 and 396.77

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Solution

The fourth proportional to 691.54, 954.18 and 396.77 is: 547.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.54 : 954.18 = 396.77 : x
  2. Step 2: Convert to fraction form
    691.54/954.18 = 396.77/x
  3. Step 3: Cross multiply
    691.54x = 954.18 × 396.77
  4. Step 4: Simplify right side
    691.54x = 378,585.23
  5. Step 5: Solve for x
    x = 378,585.23/691.54
  6. Step 6: Final answer
    x = 547.45

Related Problems

Find fourth proportional to 345.77, 477.09 and 198.38
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.