Home / 1,113.21-1,670.03-931.87

Finding the Fourth Proportional to 1,113.21, 1,670.03 and 931.87

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Solution

The fourth proportional to 1,113.21, 1,670.03 and 931.87 is: 1,397.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.21 : 1,670.03 = 931.87 : x
  2. Step 2: Convert to fraction form
    1,113.21/1,670.03 = 931.87/x
  3. Step 3: Cross multiply
    1,113.21x = 1,670.03 × 931.87
  4. Step 4: Simplify right side
    1,113.21x = 1,556,250.86
  5. Step 5: Solve for x
    x = 1,556,250.86/1,113.21
  6. Step 6: Final answer
    x = 1,397.98

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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.