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Finding the Fourth Proportional to 642,475.99, 886,622.12 and 356,000.86

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Solution

The fourth proportional to 642,475.99, 886,622.12 and 356,000.86 is: 491,284.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,475.99 : 886,622.12 = 356,000.86 : x
  2. Step 2: Convert to fraction form
    642,475.99/886,622.12 = 356,000.86/x
  3. Step 3: Cross multiply
    642,475.99x = 886,622.12 × 356,000.86
  4. Step 4: Simplify right side
    642,475.99x = 315,638,237,215.02
  5. Step 5: Solve for x
    x = 315,638,237,215.02/642,475.99
  6. Step 6: Final answer
    x = 491,284.10

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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.