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Finding the Fourth Proportional to 1,017.86, 1,403.64 and 619.58

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Solution

The fourth proportional to 1,017.86, 1,403.64 and 619.58 is: 854.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.86 : 1,403.64 = 619.58 : x
  2. Step 2: Convert to fraction form
    1,017.86/1,403.64 = 619.58/x
  3. Step 3: Cross multiply
    1,017.86x = 1,403.64 × 619.58
  4. Step 4: Simplify right side
    1,017.86x = 869,670.78
  5. Step 5: Solve for x
    x = 869,670.78/1,017.86
  6. Step 6: Final answer
    x = 854.42

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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.