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Finding the Fourth Proportional to 621.49, 931.40 and 374.39

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Solution

The fourth proportional to 621.49, 931.40 and 374.39 is: 561.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.49 : 931.40 = 374.39 : x
  2. Step 2: Convert to fraction form
    621.49/931.40 = 374.39/x
  3. Step 3: Cross multiply
    621.49x = 931.40 × 374.39
  4. Step 4: Simplify right side
    621.49x = 348,705.21
  5. Step 5: Solve for x
    x = 348,705.21/621.49
  6. Step 6: Final answer
    x = 561.08

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.