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Finding the Fourth Proportional to 1,009.88, 1,393.63 and 561.74

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Solution

The fourth proportional to 1,009.88, 1,393.63 and 561.74 is: 775.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.88 : 1,393.63 = 561.74 : x
  2. Step 2: Convert to fraction form
    1,009.88/1,393.63 = 561.74/x
  3. Step 3: Cross multiply
    1,009.88x = 1,393.63 × 561.74
  4. Step 4: Simplify right side
    1,009.88x = 782,857.72
  5. Step 5: Solve for x
    x = 782,857.72/1,009.88
  6. Step 6: Final answer
    x = 775.20

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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.