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Finding the Fourth Proportional to 853.65, 1,178.30 and 558.99

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Solution

The fourth proportional to 853.65, 1,178.30 and 558.99 is: 771.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.65 : 1,178.30 = 558.99 : x
  2. Step 2: Convert to fraction form
    853.65/1,178.30 = 558.99/x
  3. Step 3: Cross multiply
    853.65x = 1,178.30 × 558.99
  4. Step 4: Simplify right side
    853.65x = 658,655.12
  5. Step 5: Solve for x
    x = 658,655.12/853.65
  6. Step 6: Final answer
    x = 771.58

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Double scale
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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.