Home / 5,299.40-7,312.20-3,970.28

Finding the Fourth Proportional to 5,299.40, 7,312.20 and 3,970.28

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Solution

The fourth proportional to 5,299.40, 7,312.20 and 3,970.28 is: 5,478.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,299.40 : 7,312.20 = 3,970.28 : x
  2. Step 2: Convert to fraction form
    5,299.40/7,312.20 = 3,970.28/x
  3. Step 3: Cross multiply
    5,299.40x = 7,312.20 × 3,970.28
  4. Step 4: Simplify right side
    5,299.40x = 29,031,481.42
  5. Step 5: Solve for x
    x = 29,031,481.42/5,299.40
  6. Step 6: Final answer
    x = 5,478.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.