Home / 8,929.36-12,320.94-5,390.20

Finding the Fourth Proportional to 8,929.36, 12,320.94 and 5,390.20

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Solution

The fourth proportional to 8,929.36, 12,320.94 and 5,390.20 is: 7,437.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,929.36 : 12,320.94 = 5,390.20 : x
  2. Step 2: Convert to fraction form
    8,929.36/12,320.94 = 5,390.20/x
  3. Step 3: Cross multiply
    8,929.36x = 12,320.94 × 5,390.20
  4. Step 4: Simplify right side
    8,929.36x = 66,412,330.79
  5. Step 5: Solve for x
    x = 66,412,330.79/8,929.36
  6. Step 6: Final answer
    x = 7,437.52

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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.