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Finding the Fourth Proportional to 385,890.40, 578,835.60 and 119,648.80

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Solution

The fourth proportional to 385,890.40, 578,835.60 and 119,648.80 is: 179,473.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,890.40 : 578,835.60 = 119,648.80 : x
  2. Step 2: Convert to fraction form
    385,890.40/578,835.60 = 119,648.80/x
  3. Step 3: Cross multiply
    385,890.40x = 578,835.60 × 119,648.80
  4. Step 4: Simplify right side
    385,890.40x = 69,256,984,937.28
  5. Step 5: Solve for x
    x = 69,256,984,937.28/385,890.40
  6. Step 6: Final answer
    x = 179,473.20

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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.