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Finding the Fourth Proportional to 78,003.80, 117,005.70 and 28,140.20

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Solution

The fourth proportional to 78,003.80, 117,005.70 and 28,140.20 is: 42,210.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,003.80 : 117,005.70 = 28,140.20 : x
  2. Step 2: Convert to fraction form
    78,003.80/117,005.70 = 28,140.20/x
  3. Step 3: Cross multiply
    78,003.80x = 117,005.70 × 28,140.20
  4. Step 4: Simplify right side
    78,003.80x = 3,292,563,799.14
  5. Step 5: Solve for x
    x = 3,292,563,799.14/78,003.80
  6. Step 6: Final answer
    x = 42,210.30

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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.