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Finding the Fourth Proportional to 1,618.80, 2,430.30 and 840.42

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Solution

The fourth proportional to 1,618.80, 2,430.30 and 840.42 is: 1,261.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,618.80 : 2,430.30 = 840.42 : x
  2. Step 2: Convert to fraction form
    1,618.80/2,430.30 = 840.42/x
  3. Step 3: Cross multiply
    1,618.80x = 2,430.30 × 840.42
  4. Step 4: Simplify right side
    1,618.80x = 2,042,472.73
  5. Step 5: Solve for x
    x = 2,042,472.73/1,618.80
  6. Step 6: Final answer
    x = 1,261.72

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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.