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Finding the Fourth Proportional to 28,498.90, 42,748.36 and 7,438.88

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Solution

The fourth proportional to 28,498.90, 42,748.36 and 7,438.88 is: 11,158.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,498.90 : 42,748.36 = 7,438.88 : x
  2. Step 2: Convert to fraction form
    28,498.90/42,748.36 = 7,438.88/x
  3. Step 3: Cross multiply
    28,498.90x = 42,748.36 × 7,438.88
  4. Step 4: Simplify right side
    28,498.90x = 317,999,888.28
  5. Step 5: Solve for x
    x = 317,999,888.28/28,498.90
  6. Step 6: Final answer
    x = 11,158.32

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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.