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Finding the Fourth Proportional to 768,389.42, 1,151,615.16 and 389,405.40

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Solution

The fourth proportional to 768,389.42, 1,151,615.16 and 389,405.40 is: 583,617.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    768,389.42 : 1,151,615.16 = 389,405.40 : x
  2. Step 2: Convert to fraction form
    768,389.42/1,151,615.16 = 389,405.40/x
  3. Step 3: Cross multiply
    768,389.42x = 1,151,615.16 × 389,405.40
  4. Step 4: Simplify right side
    768,389.42x = 448,445,162,025.86
  5. Step 5: Solve for x
    x = 448,445,162,025.86/768,389.42
  6. Step 6: Final answer
    x = 583,617.04

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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.