Home / 20,918.95-31,349.92-11,545

Finding the Fourth Proportional to 20,918.95, 31,349.92 and 11,545

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Solution

The fourth proportional to 20,918.95, 31,349.92 and 11,545 is: 17,301.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.95 : 31,349.92 = 11,545 : x
  2. Step 2: Convert to fraction form
    20,918.95/31,349.92 = 11,545/x
  3. Step 3: Cross multiply
    20,918.95x = 31,349.92 × 11,545
  4. Step 4: Simplify right side
    20,918.95x = 361,934,826.40
  5. Step 5: Solve for x
    x = 361,934,826.40/20,918.95
  6. Step 6: Final answer
    x = 17,301.77

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1.5x scale

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.