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Finding the Fourth Proportional to 1,259.13, 1,888.70 and 393.38

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Solution

The fourth proportional to 1,259.13, 1,888.70 and 393.38 is: 590.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.13 : 1,888.70 = 393.38 : x
  2. Step 2: Convert to fraction form
    1,259.13/1,888.70 = 393.38/x
  3. Step 3: Cross multiply
    1,259.13x = 1,888.70 × 393.38
  4. Step 4: Simplify right side
    1,259.13x = 742,965.40
  5. Step 5: Solve for x
    x = 742,965.40/1,259.13
  6. Step 6: Final answer
    x = 590.06

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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.