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Finding the Fourth Proportional to 551.68, 761.22 and 318.76

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Solution

The fourth proportional to 551.68, 761.22 and 318.76 is: 439.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.68 : 761.22 = 318.76 : x
  2. Step 2: Convert to fraction form
    551.68/761.22 = 318.76/x
  3. Step 3: Cross multiply
    551.68x = 761.22 × 318.76
  4. Step 4: Simplify right side
    551.68x = 242,646.49
  5. Step 5: Solve for x
    x = 242,646.49/551.68
  6. Step 6: Final answer
    x = 439.83

Related Problems

Find fourth proportional to 275.84, 380.61 and 159.38
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.