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Finding the Fourth Proportional to 940.39, 1,298.16 and 626.21

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Solution

The fourth proportional to 940.39, 1,298.16 and 626.21 is: 864.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.39 : 1,298.16 = 626.21 : x
  2. Step 2: Convert to fraction form
    940.39/1,298.16 = 626.21/x
  3. Step 3: Cross multiply
    940.39x = 1,298.16 × 626.21
  4. Step 4: Simplify right side
    940.39x = 812,920.77
  5. Step 5: Solve for x
    x = 812,920.77/940.39
  6. Step 6: Final answer
    x = 864.45

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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.