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Finding the Fourth Proportional to 1,017.30, 1,403.99 and 619.00

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Solution

The fourth proportional to 1,017.30, 1,403.99 and 619.00 is: 854.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.30 : 1,403.99 = 619.00 : x
  2. Step 2: Convert to fraction form
    1,017.30/1,403.99 = 619.00/x
  3. Step 3: Cross multiply
    1,017.30x = 1,403.99 × 619.00
  4. Step 4: Simplify right side
    1,017.30x = 869,060.57
  5. Step 5: Solve for x
    x = 869,060.57/1,017.30
  6. Step 6: Final answer
    x = 854.28

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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.