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Finding the Fourth Proportional to 1,009, 1,393.21 and 788.57

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Solution

The fourth proportional to 1,009, 1,393.21 and 788.57 is: 1,088.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009 : 1,393.21 = 788.57 : x
  2. Step 2: Convert to fraction form
    1,009/1,393.21 = 788.57/x
  3. Step 3: Cross multiply
    1,009x = 1,393.21 × 788.57
  4. Step 4: Simplify right side
    1,009x = 1,098,643.61
  5. Step 5: Solve for x
    x = 1,098,643.61/1,009
  6. Step 6: Final answer
    x = 1,088.84

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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.