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Finding the Fourth Proportional to 1,216.16, 1,677.84 and 718.60

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Solution

The fourth proportional to 1,216.16, 1,677.84 and 718.60 is: 991.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.16 : 1,677.84 = 718.60 : x
  2. Step 2: Convert to fraction form
    1,216.16/1,677.84 = 718.60/x
  3. Step 3: Cross multiply
    1,216.16x = 1,677.84 × 718.60
  4. Step 4: Simplify right side
    1,216.16x = 1,205,695.82
  5. Step 5: Solve for x
    x = 1,205,695.82/1,216.16
  6. Step 6: Final answer
    x = 991.40

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1.5x scale

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.