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Finding the Fourth Proportional to 30,411.60, 45,646.20 and 18,747.60

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Solution

The fourth proportional to 30,411.60, 45,646.20 and 18,747.60 is: 28,139.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,411.60 : 45,646.20 = 18,747.60 : x
  2. Step 2: Convert to fraction form
    30,411.60/45,646.20 = 18,747.60/x
  3. Step 3: Cross multiply
    30,411.60x = 45,646.20 × 18,747.60
  4. Step 4: Simplify right side
    30,411.60x = 855,756,699.12
  5. Step 5: Solve for x
    x = 855,756,699.12/30,411.60
  6. Step 6: Final answer
    x = 28,139.15

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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.