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Finding the Fourth Proportional to 38,711.80, 58,075.90 and 12,435

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Solution

The fourth proportional to 38,711.80, 58,075.90 and 12,435 is: 18,655.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,711.80 : 58,075.90 = 12,435 : x
  2. Step 2: Convert to fraction form
    38,711.80/58,075.90 = 12,435/x
  3. Step 3: Cross multiply
    38,711.80x = 58,075.90 × 12,435
  4. Step 4: Simplify right side
    38,711.80x = 722,173,816.50
  5. Step 5: Solve for x
    x = 722,173,816.50/38,711.80
  6. Step 6: Final answer
    x = 18,655.13

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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.