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Finding the Fourth Proportional to 765.80, 1,146.30 and 549.80

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Solution

The fourth proportional to 765.80, 1,146.30 and 549.80 is: 822.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.80 : 1,146.30 = 549.80 : x
  2. Step 2: Convert to fraction form
    765.80/1,146.30 = 549.80/x
  3. Step 3: Cross multiply
    765.80x = 1,146.30 × 549.80
  4. Step 4: Simplify right side
    765.80x = 630,235.74
  5. Step 5: Solve for x
    x = 630,235.74/765.80
  6. Step 6: Final answer
    x = 822.98

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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.