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Finding the Fourth Proportional to 1,090.95, 1,505.84 and 718.22

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Solution

The fourth proportional to 1,090.95, 1,505.84 and 718.22 is: 991.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.95 : 1,505.84 = 718.22 : x
  2. Step 2: Convert to fraction form
    1,090.95/1,505.84 = 718.22/x
  3. Step 3: Cross multiply
    1,090.95x = 1,505.84 × 718.22
  4. Step 4: Simplify right side
    1,090.95x = 1,081,513.28
  5. Step 5: Solve for x
    x = 1,081,513.28/1,090.95
  6. Step 6: Final answer
    x = 991.35

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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.