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Finding the Fourth Proportional to 42,145.80, 63,210.60 and 12,564.60

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Solution

The fourth proportional to 42,145.80, 63,210.60 and 12,564.60 is: 18,844.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,145.80 : 63,210.60 = 12,564.60 : x
  2. Step 2: Convert to fraction form
    42,145.80/63,210.60 = 12,564.60/x
  3. Step 3: Cross multiply
    42,145.80x = 63,210.60 × 12,564.60
  4. Step 4: Simplify right side
    42,145.80x = 794,215,904.76
  5. Step 5: Solve for x
    x = 794,215,904.76/42,145.80
  6. Step 6: Final answer
    x = 18,844.49

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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.