Home / 13,281.04-18,329.40-7,978.78

Finding the Fourth Proportional to 13,281.04, 18,329.40 and 7,978.78

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Solution

The fourth proportional to 13,281.04, 18,329.40 and 7,978.78 is: 11,011.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,281.04 : 18,329.40 = 7,978.78 : x
  2. Step 2: Convert to fraction form
    13,281.04/18,329.40 = 7,978.78/x
  3. Step 3: Cross multiply
    13,281.04x = 18,329.40 × 7,978.78
  4. Step 4: Simplify right side
    13,281.04x = 146,246,250.13
  5. Step 5: Solve for x
    x = 146,246,250.13/13,281.04
  6. Step 6: Final answer
    x = 11,011.66

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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.