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Finding the Fourth Proportional to 1,075.40, 1,612.58 and 417.58

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Solution

The fourth proportional to 1,075.40, 1,612.58 and 417.58 is: 626.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.40 : 1,612.58 = 417.58 : x
  2. Step 2: Convert to fraction form
    1,075.40/1,612.58 = 417.58/x
  3. Step 3: Cross multiply
    1,075.40x = 1,612.58 × 417.58
  4. Step 4: Simplify right side
    1,075.40x = 673,381.16
  5. Step 5: Solve for x
    x = 673,381.16/1,075.40
  6. Step 6: Final answer
    x = 626.17

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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.