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Finding the Fourth Proportional to 1,858.63, 2,788.40 and 931.89

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Solution

The fourth proportional to 1,858.63, 2,788.40 and 931.89 is: 1,398.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.63 : 2,788.40 = 931.89 : x
  2. Step 2: Convert to fraction form
    1,858.63/2,788.40 = 931.89/x
  3. Step 3: Cross multiply
    1,858.63x = 2,788.40 × 931.89
  4. Step 4: Simplify right side
    1,858.63x = 2,598,463.47
  5. Step 5: Solve for x
    x = 2,598,463.47/1,858.63
  6. Step 6: Final answer
    x = 1,398.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.