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Finding the Fourth Proportional to 4,890.40, 7,319.40 and 4,307.20

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Solution

The fourth proportional to 4,890.40, 7,319.40 and 4,307.20 is: 6,446.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,890.40 : 7,319.40 = 4,307.20 : x
  2. Step 2: Convert to fraction form
    4,890.40/7,319.40 = 4,307.20/x
  3. Step 3: Cross multiply
    4,890.40x = 7,319.40 × 4,307.20
  4. Step 4: Simplify right side
    4,890.40x = 31,526,119.68
  5. Step 5: Solve for x
    x = 31,526,119.68/4,890.40
  6. Step 6: Final answer
    x = 6,446.53

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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.