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Finding the Fourth Proportional to 42,486.80, 63,730.20 and 12,903.20

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Solution

The fourth proportional to 42,486.80, 63,730.20 and 12,903.20 is: 19,354.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,486.80 : 63,730.20 = 12,903.20 : x
  2. Step 2: Convert to fraction form
    42,486.80/63,730.20 = 12,903.20/x
  3. Step 3: Cross multiply
    42,486.80x = 63,730.20 × 12,903.20
  4. Step 4: Simplify right side
    42,486.80x = 822,323,516.64
  5. Step 5: Solve for x
    x = 822,323,516.64/42,486.80
  6. Step 6: Final answer
    x = 19,354.80

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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.