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Finding the Fourth Proportional to 1,075.12, 1,612.31 and 555.40

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Solution

The fourth proportional to 1,075.12, 1,612.31 and 555.40 is: 832.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.12 : 1,612.31 = 555.40 : x
  2. Step 2: Convert to fraction form
    1,075.12/1,612.31 = 555.40/x
  3. Step 3: Cross multiply
    1,075.12x = 1,612.31 × 555.40
  4. Step 4: Simplify right side
    1,075.12x = 895,476.97
  5. Step 5: Solve for x
    x = 895,476.97/1,075.12
  6. Step 6: Final answer
    x = 832.91

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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.