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Finding the Fourth Proportional to 620.76, 855.12 and 522.48

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Solution

The fourth proportional to 620.76, 855.12 and 522.48 is: 719.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.76 : 855.12 = 522.48 : x
  2. Step 2: Convert to fraction form
    620.76/855.12 = 522.48/x
  3. Step 3: Cross multiply
    620.76x = 855.12 × 522.48
  4. Step 4: Simplify right side
    620.76x = 446,783.10
  5. Step 5: Solve for x
    x = 446,783.10/620.76
  6. Step 6: Final answer
    x = 719.74

Related Problems

Find fourth proportional to 310.38, 427.56 and 261.24
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.