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Finding the Fourth Proportional to 845.76, 1,269.78 and 435.18

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Solution

The fourth proportional to 845.76, 1,269.78 and 435.18 is: 653.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.76 : 1,269.78 = 435.18 : x
  2. Step 2: Convert to fraction form
    845.76/1,269.78 = 435.18/x
  3. Step 3: Cross multiply
    845.76x = 1,269.78 × 435.18
  4. Step 4: Simplify right side
    845.76x = 552,582.86
  5. Step 5: Solve for x
    x = 552,582.86/845.76
  6. Step 6: Final answer
    x = 653.36

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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.