Home / 10,318.80-15,470.40-5,128.32

Finding the Fourth Proportional to 10,318.80, 15,470.40 and 5,128.32

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Solution

The fourth proportional to 10,318.80, 15,470.40 and 5,128.32 is: 7,688.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,318.80 : 15,470.40 = 5,128.32 : x
  2. Step 2: Convert to fraction form
    10,318.80/15,470.40 = 5,128.32/x
  3. Step 3: Cross multiply
    10,318.80x = 15,470.40 × 5,128.32
  4. Step 4: Simplify right side
    10,318.80x = 79,337,161.73
  5. Step 5: Solve for x
    x = 79,337,161.73/10,318.80
  6. Step 6: Final answer
    x = 7,688.60

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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.