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Finding the Fourth Proportional to 28,485.40, 42,728.10 and 7,708.90

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Solution

The fourth proportional to 28,485.40, 42,728.10 and 7,708.90 is: 11,563.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,485.40 : 42,728.10 = 7,708.90 : x
  2. Step 2: Convert to fraction form
    28,485.40/42,728.10 = 7,708.90/x
  3. Step 3: Cross multiply
    28,485.40x = 42,728.10 × 7,708.90
  4. Step 4: Simplify right side
    28,485.40x = 329,386,650.09
  5. Step 5: Solve for x
    x = 329,386,650.09/28,485.40
  6. Step 6: Final answer
    x = 11,563.35

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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.