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Finding the Fourth Proportional to 39,362.40, 54,319.76 and 21,457.40

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Solution

The fourth proportional to 39,362.40, 54,319.76 and 21,457.40 is: 29,611.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,362.40 : 54,319.76 = 21,457.40 : x
  2. Step 2: Convert to fraction form
    39,362.40/54,319.76 = 21,457.40/x
  3. Step 3: Cross multiply
    39,362.40x = 54,319.76 × 21,457.40
  4. Step 4: Simplify right side
    39,362.40x = 1,165,560,818.22
  5. Step 5: Solve for x
    x = 1,165,560,818.22/39,362.40
  6. Step 6: Final answer
    x = 29,611.02

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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.