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Finding the Fourth Proportional to 666,780.21, 920,157.80 and 360,856.86

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Solution

The fourth proportional to 666,780.21, 920,157.80 and 360,856.86 is: 497,983.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,780.21 : 920,157.80 = 360,856.86 : x
  2. Step 2: Convert to fraction form
    666,780.21/920,157.80 = 360,856.86/x
  3. Step 3: Cross multiply
    666,780.21x = 920,157.80 × 360,856.86
  4. Step 4: Simplify right side
    666,780.21x = 332,045,248,007.44
  5. Step 5: Solve for x
    x = 332,045,248,007.44/666,780.21
  6. Step 6: Final answer
    x = 497,983.06

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1.5x scale

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.