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Finding the Fourth Proportional to 622.76, 860.18 and 456.72

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Solution

The fourth proportional to 622.76, 860.18 and 456.72 is: 630.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.76 : 860.18 = 456.72 : x
  2. Step 2: Convert to fraction form
    622.76/860.18 = 456.72/x
  3. Step 3: Cross multiply
    622.76x = 860.18 × 456.72
  4. Step 4: Simplify right side
    622.76x = 392,861.41
  5. Step 5: Solve for x
    x = 392,861.41/622.76
  6. Step 6: Final answer
    x = 630.84

Related Problems

Find fourth proportional to 311.38, 430.09 and 228.36
Half scale
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Double scale
Find fourth proportional to 623.76, 861.56 and 457.72
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.