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Finding the Fourth Proportional to 959.76, 1,315.98 and 866.16

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Solution

The fourth proportional to 959.76, 1,315.98 and 866.16 is: 1,187.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.76 : 1,315.98 = 866.16 : x
  2. Step 2: Convert to fraction form
    959.76/1,315.98 = 866.16/x
  3. Step 3: Cross multiply
    959.76x = 1,315.98 × 866.16
  4. Step 4: Simplify right side
    959.76x = 1,139,849.24
  5. Step 5: Solve for x
    x = 1,139,849.24/959.76
  6. Step 6: Final answer
    x = 1,187.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.