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Finding the Fourth Proportional to 385,421.20, 578,131.80 and 243,703.60

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Solution

The fourth proportional to 385,421.20, 578,131.80 and 243,703.60 is: 365,555.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,421.20 : 578,131.80 = 243,703.60 : x
  2. Step 2: Convert to fraction form
    385,421.20/578,131.80 = 243,703.60/x
  3. Step 3: Cross multiply
    385,421.20x = 578,131.80 × 243,703.60
  4. Step 4: Simplify right side
    385,421.20x = 140,892,800,934.48
  5. Step 5: Solve for x
    x = 140,892,800,934.48/385,421.20
  6. Step 6: Final answer
    x = 365,555.40

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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.