Home / 30,219.20-45,328.80-19,721.60

Finding the Fourth Proportional to 30,219.20, 45,328.80 and 19,721.60

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Solution

The fourth proportional to 30,219.20, 45,328.80 and 19,721.60 is: 29,582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,219.20 : 45,328.80 = 19,721.60 : x
  2. Step 2: Convert to fraction form
    30,219.20/45,328.80 = 19,721.60/x
  3. Step 3: Cross multiply
    30,219.20x = 45,328.80 × 19,721.60
  4. Step 4: Simplify right side
    30,219.20x = 893,956,462.08
  5. Step 5: Solve for x
    x = 893,956,462.08/30,219.20
  6. Step 6: Final answer
    x = 29,582.40

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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.