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Finding the Fourth Proportional to 845.40, 1,269.12 and 553.02

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Solution

The fourth proportional to 845.40, 1,269.12 and 553.02 is: 830.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.40 : 1,269.12 = 553.02 : x
  2. Step 2: Convert to fraction form
    845.40/1,269.12 = 553.02/x
  3. Step 3: Cross multiply
    845.40x = 1,269.12 × 553.02
  4. Step 4: Simplify right side
    845.40x = 701,848.74
  5. Step 5: Solve for x
    x = 701,848.74/845.40
  6. Step 6: Final answer
    x = 830.20

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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.