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Finding the Fourth Proportional to 19,919.20, 29,878.80 and 13,698.40

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Solution

The fourth proportional to 19,919.20, 29,878.80 and 13,698.40 is: 20,547.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,919.20 : 29,878.80 = 13,698.40 : x
  2. Step 2: Convert to fraction form
    19,919.20/29,878.80 = 13,698.40/x
  3. Step 3: Cross multiply
    19,919.20x = 29,878.80 × 13,698.40
  4. Step 4: Simplify right side
    19,919.20x = 409,291,753.92
  5. Step 5: Solve for x
    x = 409,291,753.92/19,919.20
  6. Step 6: Final answer
    x = 20,547.60

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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.