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Finding the Fourth Proportional to 19,280.64, 28,920.93 and 5,429.64

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Solution

The fourth proportional to 19,280.64, 28,920.93 and 5,429.64 is: 8,144.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,280.64 : 28,920.93 = 5,429.64 : x
  2. Step 2: Convert to fraction form
    19,280.64/28,920.93 = 5,429.64/x
  3. Step 3: Cross multiply
    19,280.64x = 28,920.93 × 5,429.64
  4. Step 4: Simplify right side
    19,280.64x = 157,030,238.37
  5. Step 5: Solve for x
    x = 157,030,238.37/19,280.64
  6. Step 6: Final answer
    x = 8,144.45

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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.