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Finding the Fourth Proportional to 670.76, 926.20 and 422.48

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Solution

The fourth proportional to 670.76, 926.20 and 422.48 is: 583.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.76 : 926.20 = 422.48 : x
  2. Step 2: Convert to fraction form
    670.76/926.20 = 422.48/x
  3. Step 3: Cross multiply
    670.76x = 926.20 × 422.48
  4. Step 4: Simplify right side
    670.76x = 391,300.98
  5. Step 5: Solve for x
    x = 391,300.98/670.76
  6. Step 6: Final answer
    x = 583.37

Related Problems

Find fourth proportional to 335.38, 463.10 and 211.24
Half scale
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Double scale
Find fourth proportional to 671.76, 927.58 and 423.48
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.