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Finding the Fourth Proportional to 810.84, 1,216.26 and 647.76

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Solution

The fourth proportional to 810.84, 1,216.26 and 647.76 is: 971.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.84 : 1,216.26 = 647.76 : x
  2. Step 2: Convert to fraction form
    810.84/1,216.26 = 647.76/x
  3. Step 3: Cross multiply
    810.84x = 1,216.26 × 647.76
  4. Step 4: Simplify right side
    810.84x = 787,844.58
  5. Step 5: Solve for x
    x = 787,844.58/810.84
  6. Step 6: Final answer
    x = 971.64

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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.