Home / 385,613.40-578,420.10-198,989.40

Finding the Fourth Proportional to 385,613.40, 578,420.10 and 198,989.40

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Solution

The fourth proportional to 385,613.40, 578,420.10 and 198,989.40 is: 298,484.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,613.40 : 578,420.10 = 198,989.40 : x
  2. Step 2: Convert to fraction form
    385,613.40/578,420.10 = 198,989.40/x
  3. Step 3: Cross multiply
    385,613.40x = 578,420.10 × 198,989.40
  4. Step 4: Simplify right side
    385,613.40x = 115,099,468,646.94
  5. Step 5: Solve for x
    x = 115,099,468,646.94/385,613.40
  6. Step 6: Final answer
    x = 298,484.10

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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.