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Finding the Fourth Proportional to 768,311.58, 1,060,330.05 and 428,830.86

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Solution

The fourth proportional to 768,311.58, 1,060,330.05 and 428,830.86 is: 591,820.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    768,311.58 : 1,060,330.05 = 428,830.86 : x
  2. Step 2: Convert to fraction form
    768,311.58/1,060,330.05 = 428,830.86/x
  3. Step 3: Cross multiply
    768,311.58x = 1,060,330.05 × 428,830.86
  4. Step 4: Simplify right side
    768,311.58x = 454,702,247,225.34
  5. Step 5: Solve for x
    x = 454,702,247,225.34/768,311.58
  6. Step 6: Final answer
    x = 591,820.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.