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Finding the Fourth Proportional to 30,420.80, 45,623.10 and 9,360.80

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Solution

The fourth proportional to 30,420.80, 45,623.10 and 9,360.80 is: 14,038.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,420.80 : 45,623.10 = 9,360.80 : x
  2. Step 2: Convert to fraction form
    30,420.80/45,623.10 = 9,360.80/x
  3. Step 3: Cross multiply
    30,420.80x = 45,623.10 × 9,360.80
  4. Step 4: Simplify right side
    30,420.80x = 427,068,714.48
  5. Step 5: Solve for x
    x = 427,068,714.48/30,420.80
  6. Step 6: Final answer
    x = 14,038.71

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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.