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Finding the Fourth Proportional to 42,787.88, 64,175.88 and 13,206.68

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Solution

The fourth proportional to 42,787.88, 64,175.88 and 13,206.68 is: 19,808.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,787.88 : 64,175.88 = 13,206.68 : x
  2. Step 2: Convert to fraction form
    42,787.88/64,175.88 = 13,206.68/x
  3. Step 3: Cross multiply
    42,787.88x = 64,175.88 × 13,206.68
  4. Step 4: Simplify right side
    42,787.88x = 847,550,310.88
  5. Step 5: Solve for x
    x = 847,550,310.88/42,787.88
  6. Step 6: Final answer
    x = 19,808.19

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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.