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Finding the Fourth Proportional to 30,155.78, 45,233.78 and 12,613.30

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Solution

The fourth proportional to 30,155.78, 45,233.78 and 12,613.30 is: 18,919.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,155.78 : 45,233.78 = 12,613.30 : x
  2. Step 2: Convert to fraction form
    30,155.78/45,233.78 = 12,613.30/x
  3. Step 3: Cross multiply
    30,155.78x = 45,233.78 × 12,613.30
  4. Step 4: Simplify right side
    30,155.78x = 570,547,108.42
  5. Step 5: Solve for x
    x = 570,547,108.42/30,155.78
  6. Step 6: Final answer
    x = 18,919.99

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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.