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Finding the Fourth Proportional to 415,862.40, 623,793.60 and 389,618.40

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Solution

The fourth proportional to 415,862.40, 623,793.60 and 389,618.40 is: 584,427.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,862.40 : 623,793.60 = 389,618.40 : x
  2. Step 2: Convert to fraction form
    415,862.40/623,793.60 = 389,618.40/x
  3. Step 3: Cross multiply
    415,862.40x = 623,793.60 × 389,618.40
  4. Step 4: Simplify right side
    415,862.40x = 243,041,464,362.24
  5. Step 5: Solve for x
    x = 243,041,464,362.24/415,862.40
  6. Step 6: Final answer
    x = 584,427.60

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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.