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Finding the Fourth Proportional to 530.90, 795.60 and 421.40

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Solution

The fourth proportional to 530.90, 795.60 and 421.40 is: 631.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.90 : 795.60 = 421.40 : x
  2. Step 2: Convert to fraction form
    530.90/795.60 = 421.40/x
  3. Step 3: Cross multiply
    530.90x = 795.60 × 421.40
  4. Step 4: Simplify right side
    530.90x = 335,265.84
  5. Step 5: Solve for x
    x = 335,265.84/530.90
  6. Step 6: Final answer
    x = 631.50

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Double scale
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Similar ratio
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1.5x scale

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.