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Finding the Fourth Proportional to 39,315, 54,253.88 and 21,410.32

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Solution

The fourth proportional to 39,315, 54,253.88 and 21,410.32 is: 29,545.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,315 : 54,253.88 = 21,410.32 : x
  2. Step 2: Convert to fraction form
    39,315/54,253.88 = 21,410.32/x
  3. Step 3: Cross multiply
    39,315x = 54,253.88 × 21,410.32
  4. Step 4: Simplify right side
    39,315x = 1,161,592,932.04
  5. Step 5: Solve for x
    x = 1,161,592,932.04/39,315
  6. Step 6: Final answer
    x = 29,545.80

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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.