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Finding the Fourth Proportional to 926.78, 1,279.53 and 646.52

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Solution

The fourth proportional to 926.78, 1,279.53 and 646.52 is: 892.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.78 : 1,279.53 = 646.52 : x
  2. Step 2: Convert to fraction form
    926.78/1,279.53 = 646.52/x
  3. Step 3: Cross multiply
    926.78x = 1,279.53 × 646.52
  4. Step 4: Simplify right side
    926.78x = 827,235.34
  5. Step 5: Solve for x
    x = 827,235.34/926.78
  6. Step 6: Final answer
    x = 892.60

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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.