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Finding the Fourth Proportional to 644,153.60, 966,230.40 and 420,204.80

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Solution

The fourth proportional to 644,153.60, 966,230.40 and 420,204.80 is: 630,307.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,153.60 : 966,230.40 = 420,204.80 : x
  2. Step 2: Convert to fraction form
    644,153.60/966,230.40 = 420,204.80/x
  3. Step 3: Cross multiply
    644,153.60x = 966,230.40 × 420,204.80
  4. Step 4: Simplify right side
    644,153.60x = 406,014,651,985.92
  5. Step 5: Solve for x
    x = 406,014,651,985.92/644,153.60
  6. Step 6: Final answer
    x = 630,307.20

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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.