Home / 20,312.31-28,031.34-11,360.79

Finding the Fourth Proportional to 20,312.31, 28,031.34 and 11,360.79

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Solution

The fourth proportional to 20,312.31, 28,031.34 and 11,360.79 is: 15,678.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,312.31 : 28,031.34 = 11,360.79 : x
  2. Step 2: Convert to fraction form
    20,312.31/28,031.34 = 11,360.79/x
  3. Step 3: Cross multiply
    20,312.31x = 28,031.34 × 11,360.79
  4. Step 4: Simplify right side
    20,312.31x = 318,458,167.16
  5. Step 5: Solve for x
    x = 318,458,167.16/20,312.31
  6. Step 6: Final answer
    x = 15,678.09

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1.5x scale

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.