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Finding the Fourth Proportional to 802.74, 1,210.98 and 778.17

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Solution

The fourth proportional to 802.74, 1,210.98 and 778.17 is: 1,173.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.74 : 1,210.98 = 778.17 : x
  2. Step 2: Convert to fraction form
    802.74/1,210.98 = 778.17/x
  3. Step 3: Cross multiply
    802.74x = 1,210.98 × 778.17
  4. Step 4: Simplify right side
    802.74x = 942,348.31
  5. Step 5: Solve for x
    x = 942,348.31/802.74
  6. Step 6: Final answer
    x = 1,173.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.