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Finding the Fourth Proportional to 578,415.20, 867,622.80 and 389,458.40

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Solution

The fourth proportional to 578,415.20, 867,622.80 and 389,458.40 is: 584,187.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,415.20 : 867,622.80 = 389,458.40 : x
  2. Step 2: Convert to fraction form
    578,415.20/867,622.80 = 389,458.40/x
  3. Step 3: Cross multiply
    578,415.20x = 867,622.80 × 389,458.40
  4. Step 4: Simplify right side
    578,415.20x = 337,902,987,491.52
  5. Step 5: Solve for x
    x = 337,902,987,491.52/578,415.20
  6. Step 6: Final answer
    x = 584,187.60

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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.