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Finding the Fourth Proportional to 1,185.80, 1,780.14 and 802.76

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Solution

The fourth proportional to 1,185.80, 1,780.14 and 802.76 is: 1,205.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.80 : 1,780.14 = 802.76 : x
  2. Step 2: Convert to fraction form
    1,185.80/1,780.14 = 802.76/x
  3. Step 3: Cross multiply
    1,185.80x = 1,780.14 × 802.76
  4. Step 4: Simplify right side
    1,185.80x = 1,429,025.19
  5. Step 5: Solve for x
    x = 1,429,025.19/1,185.80
  6. Step 6: Final answer
    x = 1,205.11

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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.