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Finding the Fourth Proportional to 415,855.40, 623,783.10 and 389,611.40

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Solution

The fourth proportional to 415,855.40, 623,783.10 and 389,611.40 is: 584,417.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,855.40 : 623,783.10 = 389,611.40 : x
  2. Step 2: Convert to fraction form
    415,855.40/623,783.10 = 389,611.40/x
  3. Step 3: Cross multiply
    415,855.40x = 623,783.10 × 389,611.40
  4. Step 4: Simplify right side
    415,855.40x = 243,033,006,887.34
  5. Step 5: Solve for x
    x = 243,033,006,887.34/415,855.40
  6. Step 6: Final answer
    x = 584,417.10

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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.