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Finding the Fourth Proportional to 1,239.56, 1,860.60 and 831.54

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Solution

The fourth proportional to 1,239.56, 1,860.60 and 831.54 is: 1,248.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.56 : 1,860.60 = 831.54 : x
  2. Step 2: Convert to fraction form
    1,239.56/1,860.60 = 831.54/x
  3. Step 3: Cross multiply
    1,239.56x = 1,860.60 × 831.54
  4. Step 4: Simplify right side
    1,239.56x = 1,547,163.32
  5. Step 5: Solve for x
    x = 1,547,163.32/1,239.56
  6. Step 6: Final answer
    x = 1,248.16

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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.