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Finding the Fourth Proportional to 402.76, 555.44 and 253.20

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Solution

The fourth proportional to 402.76, 555.44 and 253.20 is: 349.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.76 : 555.44 = 253.20 : x
  2. Step 2: Convert to fraction form
    402.76/555.44 = 253.20/x
  3. Step 3: Cross multiply
    402.76x = 555.44 × 253.20
  4. Step 4: Simplify right side
    402.76x = 140,637.41
  5. Step 5: Solve for x
    x = 140,637.41/402.76
  6. Step 6: Final answer
    x = 349.18

Related Problems

Find fourth proportional to 201.38, 277.72 and 126.60
Half scale
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Double scale
Find fourth proportional to 403.76, 556.82 and 254.20
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.