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Finding the Fourth Proportional to 1,141.12, 1,710.24 and 987.04

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Solution

The fourth proportional to 1,141.12, 1,710.24 and 987.04 is: 1,479.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.12 : 1,710.24 = 987.04 : x
  2. Step 2: Convert to fraction form
    1,141.12/1,710.24 = 987.04/x
  3. Step 3: Cross multiply
    1,141.12x = 1,710.24 × 987.04
  4. Step 4: Simplify right side
    1,141.12x = 1,688,075.29
  5. Step 5: Solve for x
    x = 1,688,075.29/1,141.12
  6. Step 6: Final answer
    x = 1,479.31

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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.