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Finding the Fourth Proportional to 42,690.80, 64,047.40 and 16,396.40

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Solution

The fourth proportional to 42,690.80, 64,047.40 and 16,396.40 is: 24,598.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,690.80 : 64,047.40 = 16,396.40 : x
  2. Step 2: Convert to fraction form
    42,690.80/64,047.40 = 16,396.40/x
  3. Step 3: Cross multiply
    42,690.80x = 64,047.40 × 16,396.40
  4. Step 4: Simplify right side
    42,690.80x = 1,050,146,789.36
  5. Step 5: Solve for x
    x = 1,050,146,789.36/42,690.80
  6. Step 6: Final answer
    x = 24,598.90

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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.