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Finding the Fourth Proportional to 623,142.80, 934,714.20 and 385,715.60

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Solution

The fourth proportional to 623,142.80, 934,714.20 and 385,715.60 is: 578,573.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    623,142.80 : 934,714.20 = 385,715.60 : x
  2. Step 2: Convert to fraction form
    623,142.80/934,714.20 = 385,715.60/x
  3. Step 3: Cross multiply
    623,142.80x = 934,714.20 × 385,715.60
  4. Step 4: Simplify right side
    623,142.80x = 360,533,848,481.52
  5. Step 5: Solve for x
    x = 360,533,848,481.52/623,142.80
  6. Step 6: Final answer
    x = 578,573.40

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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.