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Finding the Fourth Proportional to 803.94, 1,109.50 and 509.10

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Solution

The fourth proportional to 803.94, 1,109.50 and 509.10 is: 702.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.94 : 1,109.50 = 509.10 : x
  2. Step 2: Convert to fraction form
    803.94/1,109.50 = 509.10/x
  3. Step 3: Cross multiply
    803.94x = 1,109.50 × 509.10
  4. Step 4: Simplify right side
    803.94x = 564,846.45
  5. Step 5: Solve for x
    x = 564,846.45/803.94
  6. Step 6: Final answer
    x = 702.60

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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.