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Finding the Fourth Proportional to 28,459.90, 42,685.80 and 9,740.80

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Solution

The fourth proportional to 28,459.90, 42,685.80 and 9,740.80 is: 14,609.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,459.90 : 42,685.80 = 9,740.80 : x
  2. Step 2: Convert to fraction form
    28,459.90/42,685.80 = 9,740.80/x
  3. Step 3: Cross multiply
    28,459.90x = 42,685.80 × 9,740.80
  4. Step 4: Simplify right side
    28,459.90x = 415,793,840.64
  5. Step 5: Solve for x
    x = 415,793,840.64/28,459.90
  6. Step 6: Final answer
    x = 14,609.81

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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.