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Finding the Fourth Proportional to 810.78, 1,118.78 and 456.68

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Solution

The fourth proportional to 810.78, 1,118.78 and 456.68 is: 630.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.78 : 1,118.78 = 456.68 : x
  2. Step 2: Convert to fraction form
    810.78/1,118.78 = 456.68/x
  3. Step 3: Cross multiply
    810.78x = 1,118.78 × 456.68
  4. Step 4: Simplify right side
    810.78x = 510,922.95
  5. Step 5: Solve for x
    x = 510,922.95/810.78
  6. Step 6: Final answer
    x = 630.16

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Double scale
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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.