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Finding the Fourth Proportional to 654.65, 903.72 and 421.37

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Solution

The fourth proportional to 654.65, 903.72 and 421.37 is: 581.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.65 : 903.72 = 421.37 : x
  2. Step 2: Convert to fraction form
    654.65/903.72 = 421.37/x
  3. Step 3: Cross multiply
    654.65x = 903.72 × 421.37
  4. Step 4: Simplify right side
    654.65x = 380,800.50
  5. Step 5: Solve for x
    x = 380,800.50/654.65
  6. Step 6: Final answer
    x = 581.69

Related Problems

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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.