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Finding the Fourth Proportional to 19,931.20, 29,898.96 and 7,457.20

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Solution

The fourth proportional to 19,931.20, 29,898.96 and 7,457.20 is: 11,186.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,931.20 : 29,898.96 = 7,457.20 : x
  2. Step 2: Convert to fraction form
    19,931.20/29,898.96 = 7,457.20/x
  3. Step 3: Cross multiply
    19,931.20x = 29,898.96 × 7,457.20
  4. Step 4: Simplify right side
    19,931.20x = 222,962,524.51
  5. Step 5: Solve for x
    x = 222,962,524.51/19,931.20
  6. Step 6: Final answer
    x = 11,186.61

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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.