Home / 31,307.60-43,221.12-21,289.52

Finding the Fourth Proportional to 31,307.60, 43,221.12 and 21,289.52

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Solution

The fourth proportional to 31,307.60, 43,221.12 and 21,289.52 is: 29,390.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,307.60 : 43,221.12 = 21,289.52 : x
  2. Step 2: Convert to fraction form
    31,307.60/43,221.12 = 21,289.52/x
  3. Step 3: Cross multiply
    31,307.60x = 43,221.12 × 21,289.52
  4. Step 4: Simplify right side
    31,307.60x = 920,156,898.66
  5. Step 5: Solve for x
    x = 920,156,898.66/31,307.60
  6. Step 6: Final answer
    x = 29,390.85

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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.