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Finding the Fourth Proportional to 926.51, 1,278.60 and 506.81

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Solution

The fourth proportional to 926.51, 1,278.60 and 506.81 is: 699.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.51 : 1,278.60 = 506.81 : x
  2. Step 2: Convert to fraction form
    926.51/1,278.60 = 506.81/x
  3. Step 3: Cross multiply
    926.51x = 1,278.60 × 506.81
  4. Step 4: Simplify right side
    926.51x = 648,002.08
  5. Step 5: Solve for x
    x = 648,002.08/926.51
  6. Step 6: Final answer
    x = 699.40

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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.