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Finding the Fourth Proportional to 621,000.15, 931,500.23 and 420,233.55

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Solution

The fourth proportional to 621,000.15, 931,500.23 and 420,233.55 is: 630,350.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,000.15 : 931,500.23 = 420,233.55 : x
  2. Step 2: Convert to fraction form
    621,000.15/931,500.23 = 420,233.55/x
  3. Step 3: Cross multiply
    621,000.15x = 931,500.23 × 420,233.55
  4. Step 4: Simplify right side
    621,000.15x = 391,447,646,377.55
  5. Step 5: Solve for x
    x = 391,447,646,377.55/621,000.15
  6. Step 6: Final answer
    x = 630,350.33

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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.