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Finding the Fourth Proportional to 854.04, 1,178.76 and 644.88

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Solution

The fourth proportional to 854.04, 1,178.76 and 644.88 is: 890.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.04 : 1,178.76 = 644.88 : x
  2. Step 2: Convert to fraction form
    854.04/1,178.76 = 644.88/x
  3. Step 3: Cross multiply
    854.04x = 1,178.76 × 644.88
  4. Step 4: Simplify right side
    854.04x = 760,158.75
  5. Step 5: Solve for x
    x = 760,158.75/854.04
  6. Step 6: Final answer
    x = 890.07

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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.