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Finding the Fourth Proportional to 1,339.60, 1,848.70 and 815.26

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Solution

The fourth proportional to 1,339.60, 1,848.70 and 815.26 is: 1,125.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.60 : 1,848.70 = 815.26 : x
  2. Step 2: Convert to fraction form
    1,339.60/1,848.70 = 815.26/x
  3. Step 3: Cross multiply
    1,339.60x = 1,848.70 × 815.26
  4. Step 4: Simplify right side
    1,339.60x = 1,507,171.16
  5. Step 5: Solve for x
    x = 1,507,171.16/1,339.60
  6. Step 6: Final answer
    x = 1,125.09

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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.