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Finding the Fourth Proportional to 28,492.80, 42,739.20 and 7,716.30

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Solution

The fourth proportional to 28,492.80, 42,739.20 and 7,716.30 is: 11,574.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,492.80 : 42,739.20 = 7,716.30 : x
  2. Step 2: Convert to fraction form
    28,492.80/42,739.20 = 7,716.30/x
  3. Step 3: Cross multiply
    28,492.80x = 42,739.20 × 7,716.30
  4. Step 4: Simplify right side
    28,492.80x = 329,788,488.96
  5. Step 5: Solve for x
    x = 329,788,488.96/28,492.80
  6. Step 6: Final answer
    x = 11,574.45

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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.