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Finding the Fourth Proportional to 28,089.30, 42,133.95 and 7,312.80

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Solution

The fourth proportional to 28,089.30, 42,133.95 and 7,312.80 is: 10,969.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,089.30 : 42,133.95 = 7,312.80 : x
  2. Step 2: Convert to fraction form
    28,089.30/42,133.95 = 7,312.80/x
  3. Step 3: Cross multiply
    28,089.30x = 42,133.95 × 7,312.80
  4. Step 4: Simplify right side
    28,089.30x = 308,117,149.56
  5. Step 5: Solve for x
    x = 308,117,149.56/28,089.30
  6. Step 6: Final answer
    x = 10,969.20

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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.