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Finding the Fourth Proportional to 1,090.76, 1,505.30 and 642.88

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Solution

The fourth proportional to 1,090.76, 1,505.30 and 642.88 is: 887.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.76 : 1,505.30 = 642.88 : x
  2. Step 2: Convert to fraction form
    1,090.76/1,505.30 = 642.88/x
  3. Step 3: Cross multiply
    1,090.76x = 1,505.30 × 642.88
  4. Step 4: Simplify right side
    1,090.76x = 967,727.26
  5. Step 5: Solve for x
    x = 967,727.26/1,090.76
  6. Step 6: Final answer
    x = 887.20

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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.