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Finding the Fourth Proportional to 1,131.12, 1,561.01 and 688.95

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Solution

The fourth proportional to 1,131.12, 1,561.01 and 688.95 is: 950.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.12 : 1,561.01 = 688.95 : x
  2. Step 2: Convert to fraction form
    1,131.12/1,561.01 = 688.95/x
  3. Step 3: Cross multiply
    1,131.12x = 1,561.01 × 688.95
  4. Step 4: Simplify right side
    1,131.12x = 1,075,457.84
  5. Step 5: Solve for x
    x = 1,075,457.84/1,131.12
  6. Step 6: Final answer
    x = 950.79

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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.