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Finding the Fourth Proportional to 530.85, 794.43 and 421.50

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Solution

The fourth proportional to 530.85, 794.43 and 421.50 is: 630.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.85 : 794.43 = 421.50 : x
  2. Step 2: Convert to fraction form
    530.85/794.43 = 421.50/x
  3. Step 3: Cross multiply
    530.85x = 794.43 × 421.50
  4. Step 4: Simplify right side
    530.85x = 334,852.25
  5. Step 5: Solve for x
    x = 334,852.25/530.85
  6. Step 6: Final answer
    x = 630.79

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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.