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Finding the Fourth Proportional to 602.40, 831.05 and 378.20

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Solution

The fourth proportional to 602.40, 831.05 and 378.20 is: 521.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.40 : 831.05 = 378.20 : x
  2. Step 2: Convert to fraction form
    602.40/831.05 = 378.20/x
  3. Step 3: Cross multiply
    602.40x = 831.05 × 378.20
  4. Step 4: Simplify right side
    602.40x = 314,297.06
  5. Step 5: Solve for x
    x = 314,297.06/602.40
  6. Step 6: Final answer
    x = 521.74

Related Problems

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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.