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Finding the Fourth Proportional to 555.19, 766.10 and 306.49

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Solution

The fourth proportional to 555.19, 766.10 and 306.49 is: 422.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.19 : 766.10 = 306.49 : x
  2. Step 2: Convert to fraction form
    555.19/766.10 = 306.49/x
  3. Step 3: Cross multiply
    555.19x = 766.10 × 306.49
  4. Step 4: Simplify right side
    555.19x = 234,800.46
  5. Step 5: Solve for x
    x = 234,800.46/555.19
  6. Step 6: Final answer
    x = 422.92

Related Problems

Find fourth proportional to 277.60, 383.05 and 153.25
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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.