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Finding the Fourth Proportional to 623.44, 860.76 and 402.76

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Solution

The fourth proportional to 623.44, 860.76 and 402.76 is: 556.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.44 : 860.76 = 402.76 : x
  2. Step 2: Convert to fraction form
    623.44/860.76 = 402.76/x
  3. Step 3: Cross multiply
    623.44x = 860.76 × 402.76
  4. Step 4: Simplify right side
    623.44x = 346,679.70
  5. Step 5: Solve for x
    x = 346,679.70/623.44
  6. Step 6: Final answer
    x = 556.08

Related Problems

Find fourth proportional to 311.72, 430.38 and 201.38
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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.