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Finding the Fourth Proportional to 1,005.51, 1,387.60 and 563.42

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Solution

The fourth proportional to 1,005.51, 1,387.60 and 563.42 is: 777.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.51 : 1,387.60 = 563.42 : x
  2. Step 2: Convert to fraction form
    1,005.51/1,387.60 = 563.42/x
  3. Step 3: Cross multiply
    1,005.51x = 1,387.60 × 563.42
  4. Step 4: Simplify right side
    1,005.51x = 781,796.06
  5. Step 5: Solve for x
    x = 781,796.06/1,005.51
  6. Step 6: Final answer
    x = 777.51

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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.