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Finding the Fourth Proportional to 931.14, 1,390.48 and 877.14

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Solution

The fourth proportional to 931.14, 1,390.48 and 877.14 is: 1,309.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.14 : 1,390.48 = 877.14 : x
  2. Step 2: Convert to fraction form
    931.14/1,390.48 = 877.14/x
  3. Step 3: Cross multiply
    931.14x = 1,390.48 × 877.14
  4. Step 4: Simplify right side
    931.14x = 1,219,645.63
  5. Step 5: Solve for x
    x = 1,219,645.63/931.14
  6. Step 6: Final answer
    x = 1,309.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.