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Finding the Fourth Proportional to 1,807.92, 2,711.25 and 509.40

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Solution

The fourth proportional to 1,807.92, 2,711.25 and 509.40 is: 763.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,807.92 : 2,711.25 = 509.40 : x
  2. Step 2: Convert to fraction form
    1,807.92/2,711.25 = 509.40/x
  3. Step 3: Cross multiply
    1,807.92x = 2,711.25 × 509.40
  4. Step 4: Simplify right side
    1,807.92x = 1,381,110.75
  5. Step 5: Solve for x
    x = 1,381,110.75/1,807.92
  6. Step 6: Final answer
    x = 763.92

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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.