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Finding the Fourth Proportional to 1,344.80, 1,855.98 and 785.45

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Solution

The fourth proportional to 1,344.80, 1,855.98 and 785.45 is: 1,084.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,344.80 : 1,855.98 = 785.45 : x
  2. Step 2: Convert to fraction form
    1,344.80/1,855.98 = 785.45/x
  3. Step 3: Cross multiply
    1,344.80x = 1,855.98 × 785.45
  4. Step 4: Simplify right side
    1,344.80x = 1,457,784.13
  5. Step 5: Solve for x
    x = 1,457,784.13/1,344.80
  6. Step 6: Final answer
    x = 1,084.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.